ClawsandEffect

In the case of Maruader, I believe he can stack stuns pretty quickly if his attacks all land. Work on getting more defense so he hits you less frequently and you should be in better shape.

You need Unyielding if you don't have it. That's Invuln's mez protection. If you're getting stunned through Unyielding, then I don't know what to tell you, neither one of them should be able to break through it.

A softcapped Willpower tank can achieve ridiculous levels of survivability as well, and it isn't that hard to do.

While it won't have the same resistances as a Stone tank, it also won't have the glaring Psi hole that a perma-Granite tank will have to deal with. And when something DOES get through, your insane amounts of regen will make it so you will barely notice you've been hit, because you won't see your HP bar go down unless you are actively watching it.

Also, out of the two, Willpower/Electric will do more damage, due to not having the -recharge debuff that Granite gives you.

Downside is Willpower has a weak taunt aura, so you will need to put at least one taunt IO in RttC and actively use Taunt in order to hold agro well.

My vote is Willpower, but there are pluses and minuses to both builds.

One huge problem with your updated build: No Moment of Glory.

Drop Assault, and take Tactics at 35. You're a scrapper, you shouldn't need Assault to deal good damage.

Take a few slots from Tactics and put 3 slots in MoG (LotG +Recharge, LotG Def/Rech, 2 generic Recharge) Replace the Adjusted Targeting in Tactics with 2 Rectified Reticle and maybe a generic EndRed. Doing that gives you a net gain of 2.5% recharge, some more S/L defense, and you get one of regen's best powers. (MoG lets you do the one thing regen isn't good at without it: Take Alpha strikes. It caps defense and resistance for 15 seconds, with no crash. You want it, and you want it recharging as fast as possible)

Find a slot to put in Hasten, if you have it 3 slotted with level 50 recharge IOs you should be under the threshold for perma Dull Pain, but Hasten needs another slot to get there.

Sorry I didn't get a chance to post a build. The explanation can be found in my sig

Looks like you have everything well in hand though. I don't see anything I would be especially concerned about changing in your last build.

Why no Frozen Aura?

It deals the same base damage as Foot Stomp now you know.

Also, the Regenerative Tissue unique is not good in Earth's Embrace. You only get the bonus for two minutes after you click the power. It would be better placed in Health.

You can softcap this character pretty easily to Smashing/Lethal/Energy/Negative, but the way you are slotted isn't going to do it I don't think (I'm at work so I can't access Mids at the moment)

Fire and Cold damage are less common than Energy and Negative, and the vast majority of Cold attacks have a Smashing or Lethal component (meaning your S/L defense will defend against them as well)

I recommend slotting your PBAoE powers with 4xEradication and 2xScirocco's Dervish. Doing that nets you: 1.8% more endurance, 3.75% E/N defense, 2.25% max HP (really important for a WP tank), and another 10% regen from Scirocco's.

You have the right idea with the Kinetic Combats in your single target attacks, but I would replace the Aegis you have in some of your powers with Reactive Armor (and drop the 5th one from Tough and put your Steadfast Res/Def there instead). Alternately you could replace Resurgance with Strength of Will and put the Steadfast Res/Def there instead. (that's actually the route I'd go)

You also have the right idea with slotting Numina's where you can. I would do the same with High Pain Tolerance (you can slot 3 Numina's for the Regen/max HP bonus, and 3 Aegis for the F/C defense)

Slot Taunt with 4xMocking Beratement. Willpower has a Weak Taunt aura so you'll want to add some duration to your Taunt, and Mocking Beratement gives you 2.5% to S/L defense.

Pull the Performance Shifter ENdMod/Acc/Rech and Acc/Rech out of Quick Recovery and put in a Performance Shifter Chance for +End. Put a Chance for +end in Physical Perfection as well. (they are not uniques, so you can put in as many as you have powers that will take them, I'd put one in Stamina too when it becomes inherent) They check to give you a flat 10 endurance back every 10 seconds when put in a passive power, which is unaffected by recovery debuffs.

Replace the LotG Def/EndRed in Combat Jumping with a Kismet +6% Accuracy (it's name is misleading, it is actually a to-hit buff, which is much better than accuracy)

Replace the GSFC in Build Up with a 2xRectified Reticle and a generic recharge IO, gives you another 1.88% S/L defense.

That's about all that jumps out at me, hope it helps.

I'm not entirely against the possibility of a compromise.

I wouldn't have a problem with, for example, increasing the hold protection in Acrobatics from Mag 2 to Mag 3. It's already there, so increasing the amount of protection by 1 wouldn't be a big deal.

I also wouldn't have a problem with increasing the amount of mez resistance IOs grant you to an amount actually worth slotting for. Currently, the 1-2% resistance you can get out of them isn't even worth the slots you spend on it. Increasing that to 5-6% for the majority and maybe 10-15% for the exceptionally rare ones shouldn't unbalance anything, and might make things a little easier for those who choose to play support characters.

I still don't think support characters should be given passive protection from everything, but there IS room for compromise.

Regen wants recharge before defense, so you can get your heals back faster.

I'd 5 slot all your heals with Doctored Wounds, and I think you already have 2 Obliteration sets on there.

I would definitely NOT slot Reconstruction with Reactive Armor.

I say this for the following reason: Regen has ZERO defense debuff resistance. Now, defense debuffs are extremely common in the game, anything with a machine gun will apply them. So, if you focus all yourslotting toward hitting the softcap to S/L you are not going to have anything left over for your heals and recharge bonuses. If you start getting debuffed, you are very likely to KEEP getting debuffed. Your defense will disappear quickly, and if you short-slotted all your heals to get there you're going to be in a bad spot.

Just food for thought. My Claws/Regen has about 30% S/L defense and still manages to keep my heals slotted well, and I have perma-Dull Pain potential (you only need 55% global recharge + 3 slotted Hasten to get there) He's very survivable, and I didn't compromise what Regen is good at to get more defense.

Oh yeah, you also REALLY want Integration before level 28. If you exemp to run Positron or Synapse you will lose your mez protection. I'd take it as soon as it's available.

I never just give someone a build because they said "I need a build for X to do Y"

If I see a thread that starts out like that, I'll give them some basic advice on how to go about building the character themselves and be on my way.

I'll usually reply in my first post with a request to give me more of an idea what they want the character to do, and a suggestion to post their own so people reading it have an idea what they have in mind. If such information is not forthcoming, I ignore it and again move on.

I will happily give any advice I may have about a given powerset combo, but I don't like being asked to do all the work for them.