Local_Man

I know a LOT about Rad -- take a look at my Ill/Rad guide for tons of information on the Radiation Secondary, including some strategy hint. I have a few suggestions on your build:

Crush: To me, Crush is a damage power, especially if you expect to solo. Hold-Crush-Propel is my damage chain. Crush's DoT will often kill the last few HP on its own. I see no reason to slot it for immobilize when it easily recharges faster than its duration. Slot it up with Ranged Damage.

Grad Dist: I slot GD with a mixture of Acc, Hold, Rech and Damage. I need the damage in it too much to slot it only as a hold.

Accelerate Metabolism: This buff you want up as much as possible. This is one of the powers that makes Rad so good, and does a lot more than just buff your Recovery. Put 3 slots in immediately, then three more later. Max slot it for Recharge first, then EndMod as you have room. Eventually, 6-slot it with the Efficiency Adaptor set, but replace the EndMod/Acc with a common Recharge unless you have a bunch of Global Recharge.

I take Propel at level 6 -- love that damage.

I like Crushing Field and Radiation Infection then as soon as possible. Why? RI provides a large ToHit Debuff on a foe-anchored toggle. Crushing Field keeps them from moving around out of the effect of RI. So CR+RI is almost an AoE Hold, where the foes can't move and can't hit you hardly at all. Keep spamming Crushing Field and you have AoE control! And with Grav, you need all the AoE control you can get!

Enervating Field uses a LOT of endurance. I always delay EF until AFTER Stamina. 2 EndRed are enough, as that third one will only reduce your Endurance usage by .05%, but you can put that third one in if you feel it is worth it.

On a Grav/Rad, your primary provides some slow, so Ling Rad isn't badly needed . . . until you need its huge -Regen for AVs. You don't really need to slot it for slow. 30 Sec duration, 90 Sec Recharge. I slot it 1 Acc, 3 Recharge first, then add a second Accuracy to hit higher level AVs. Eventually, I go with 1 Acc, 2 Rech, Tempered Readiness Acc/Slow, Tempered Readiness EndRdx/Rech/Slow.

Fallout is one of the most situational powers in the game. My guides explain why. It can be fun and effective, assuming you have teammates who die on a regular basis. Think of it as a Nuke, and slot it up for Damage and Recharge. It already has high accuracy. If you need more debuff, use RI and EF.

Dimension Shift: Don't. Just don't. Everyone says that phase shift powers suck. I decided to try one on another character (Black Hole on a */Dark MM) since I hadn't tried it before. And I found out immediately . . . phase shift powers suck. No matter how I tried to use it, I hated it. (And I try to pride myself on finding uses for powers that everyone else hates, but not this one.) Instead, take EM Pulse. It is one of the best AoE holds in the game -- huge radius, fires quickly, long hold and no accuracy penalty. It is an awesome "panic button" power that can be used in many other situations. Instead of draining your endurance, it just stops your recovery of Endurance for about 15 seconds -- one Blue Insp pretty much takes care of that.

Choking Cloud: not a good match for Grav/Rad. Works great with Fire/Rad and pretty well with Ice/Rad for the reasons explained in my guides. To make this work reasonably well, you need to max slot it with EndRdx and Hold -- and even then, CC is pretty funky. I would take Mutation over CC, unless you mostly solo. Then I would consider Lift or another APP power.

A agree with most of the points above. You can put the Expediant Reinforcement (Recharge intensive pet) set in Tornado for a little more recharge.

I love the Chance for Hold proc from Devistation in Lightning Storm -- it has a chance to hit with every lightning strike, and it seems to hit often . . . plus the Tesla cage effect goes with the lightning theme.

In addition to the Social Group on the boards. we now have a "Control Freaks" global Channel. It is a place in game to discuss your controllers, or your soon-to-be controllers.

While in game, just type /chan_join Control Freaks

Was my guide one of the ones you looked at? It is more recent than I-13, so I'm not sure. I'm not as much into the "max" builds, and prefer more general utility than the almost-billion Infl builds. But for a max build for max Infl, you have what is needed.

I prefer to have both Flash and EM Pulse for the reasons stated in my guide. I also prefer to avoid taking both SI and GI, just as a mule for more IO sets. You can actually get perma-PA without spending so much and taking mostly useless powers.

The first thing that came to mind when I read your post was "Ice/Ice Blaster." Holds and slows with very good single target damage. It is almost a high damage controller. When you finally get Shiver, it becomes awesome for handling groups.

For a good single target Scrapper, consider the Dark Melee primary. It lacks AoE . . . and the single target attacks all debuff ToHit, making it less likely for that guy to hit anyone. Plus, Touch of Fear will stack with Mind's Terrify to take out bosses.

There are a few ways around this limitation, however. Some binds can activate toggle powers and still do execute a click-type power. Or . . .

(There are third-party products that allow you to program macros that will execute numerous commands. This mostly include game-type controllers and keyboards.)

Superior Invis vs. Group Invis is one of those personal choice things. I leveled my first Ill/Rad using GI, but then switched to SI at 50. Ill/Rad has the endurance boost from AM that makes it fairly easy to handle the added Endurance demand. My Ill/TA had SI the entire time, but I may switch him to GI because he doesn't have that end boost. My Ill/kin has GI . . . .

I find the continual re-casting of GI to be a real pain. But it uses a lot less endurance.