Considering a Spines/Fire.. How's this build look what changes might I want to shoot for?

My love for all things scrappers makes me want to see a /fa through to the end, and i'm thinking Spines could be fun to build it on.

So hows this build look? What could I tweak for a bit more performance?
Is spines a good choice for /fa?

Hero Plan by Mids' Hero Designer 1.803
http://www.cohplanner.com/

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Magmaspur: Level 50 Magic Scrapper
Primary Power Set: Spines
Secondary Power Set: Fiery Aura
Power Pool: Fitness
Power Pool: Fighting
Power Pool: Leaping
Power Pool: Speed
Ancillary Pool: Body Mastery

Hero Profile:
Level 1: Lunge -- KntkC'bat-Acc/Dmg(A), KntkC'bat-Dmg/EndRdx(3), KntkC'bat-Dmg/Rchg(5), KntkC'bat-Dmg/EndRdx/Rchg(17), C'ngImp-Acc/Dmg(40)
Level 1: Fire Shield -- S'fstPrt-ResDam/Def+(A), S'fstPrt-ResKB(13), Aegis-ResDam/EndRdx(23), Aegis-ResDam(27), Aegis-ResDam/EndRdx/Rchg(37), EndRdx-I(46)
Level 2: Blazing Aura -- Sciroc-Acc/Dmg/EndRdx(A), Sciroc-Dmg/EndRdx(3), Erad-Acc/Dmg/EndRdx/Rchg(5), Erad-Acc/Dmg/Rchg(9), Erad-Dmg(34)
Level 4: Healing Flames -- Dct'dW-Rchg(A), Dct'dW-EndRdx/Rchg(11), Dct'dW-Heal/Rchg(13), Dct'dW-Heal/EndRdx/Rchg(37), Dct'dW-Heal(42)
Level 6: Spine Burst -- Erad-Acc/Rchg(A), Erad-Acc/Dmg/EndRdx/Rchg(7), Erad-Dmg(7), Erad-Acc/Dmg/Rchg(15), Oblit-Acc/Dmg/EndRdx/Rchg(43)
Level 8: Impale -- Decim-Acc/Dmg(A), Decim-Dmg/EndRdx(9), Decim-Dmg/Rchg(11), Decim-Acc/EndRdx/Rchg(15), Decim-Build%(43)
Level 10: Swift -- Run-I(A)
Level 12: Boxing -- Empty(A)
Level 14: Health -- Numna-Regen/Rcvry+(A)
Level 16: Plasma Shield -- Aegis-ResDam/EndRdx(A), Aegis-ResDam/Rchg(17), Aegis-EndRdx/Rchg(25), Aegis-ResDam/EndRdx/Rchg(27), Aegis-ResDam(46)
Level 18: Quills -- Erad-Acc/Dmg/EndRdx/Rchg(A), Erad-Dmg(19), Erad-Acc/Dmg/Rchg(19), Sciroc-Dmg/EndRdx(23), Sciroc-Acc/Dmg/EndRdx(34)
Level 20: Stamina -- P'Shift-EndMod(A), P'Shift-EndMod/Acc(21), P'Shift-EndMod/Rchg(21), P'Shift-End%(48)
Level 22: Build Up -- GSFC-ToHit(A), GSFC-ToHit/Rchg(36), GSFC-ToHit/Rchg/EndRdx(48), GSFC-Rchg/EndRdx(48), GSFC-ToHit/EndRdx(50), GSFC-Build%(50)
Level 24: Tough -- Aegis-ResDam/EndRdx(A), Aegis-ResDam(25), Aegis-ResDam/EndRdx/Rchg(37)
Level 26: Ripper -- Erad-Acc/Rchg(A), Erad-Dmg(31), Erad-Acc/Dmg/Rchg(31), Sciroc-Dmg/EndRdx(34), Sciroc-Acc/Dmg/EndRdx(43)
Level 28: Burn -- Erad-Dmg/Rchg(A), Erad-Acc/Dmg/Rchg(29), Erad-Dmg(29), M'Strk-Dmg/Rchg(36)
Level 30: Consume -- Efficacy-EndMod/Acc(A), Efficacy-EndMod/Acc/Rchg(31), Efficacy-Acc/Rchg(40), Efficacy-EndMod/Rchg(40), Efficacy-EndMod(46)
Level 32: Throw Spines -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(33), Posi-Dmg/Rchg(33), Posi-Dam%(33), Posi-Acc/Dmg/EndRdx(45)
Level 35: Fiery Embrace -- RechRdx-I(A), RechRdx-I(36)
Level 38: Weave -- S'dpty-Def/EndRdx(A), S'dpty-Def/Rchg(39), S'dpty-Def(39), S'dpty-EndRdx(39)
Level 41: Combat Jumping -- LkGmblr-Def/EndRdx(A), LkGmblr-Def(42), LkGmblr-Rchg+(42)
Level 44: Hasten -- RechRdx-I(A), RechRdx-I(45), RechRdx-I(45)
Level 47: Conserve Power -- RechRdx-I(A), RechRdx-I(50)
Level 49: Rise of the Phoenix -- RechRdx-I(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Critical Hit
Level 4: Ninja Run

I've played a Spine/Invuln Scrapper to 50 and a Fire/Energy Tanker to 50 back in the day.

Currently I have a level 28 Spine/Fire which I am finding to be not nearly as much fun as I remember having with either other character (both pre-Global Defense, ED, etc). As a matter of fact, I died four times in a row last night to some Arachnos.

The think is, the combination oozes potential, but you have to get into the 40s before it reaches that potential.

I think I'm going to transfer as much money as I can afford to him and go shopping. I need some +Def, Res, Reg and Recov to make the build more bearable.

Plus, I'll have to add Boxing/Tough/Weave at some point, but as is, I only have three attacks (lunge, Impale, Ripper), so Throw Spines must be gotten immediately, as will Burn and Fiery Embrace.

It seems to be a really tight build, almost unbearably so. But I think if you go through the exercise, it pays off in the end.

Fire is ridiculously squishy. a Spines/Fire will want to adhere to the plan of, 'Kill them as fast as I can before they kill me.'
I suspect you'll want Hasten earlier in the build.

When things go right, it is truly awesome.

When they go wrong, they go wrong in a hurry.

In my 40 levels of Spines/Fire I've found that the line between "Engine of destruction" and "doorstop" is a fine one.

I don't mind the squishiness of my new spines/fire. I'll just play him like I do my Blasters. I play my blasters about as aggressive as my fire/SD Scrapper, so I guess nothing is really gonna change. Debt makes me all tingly inside.

Does anyone have suggestions to get the most Def/Regen/Recov bonuses out of IOs for Fire? There has to be a way to make the thing survivable. At the point I'm at, it really isn't.

The problem is not totally gimping your recovery and endurance management if you don't take physical perfection.

If you want to run Quills + Blazing Aura + All your shields + CJ or SS or Assault or Manuevers + a never ending AOE and ST attack chain + a recycling shadow meld, you're going to be sucking some serious wind- better have a pocket kin if you run a toggle heavy build unless you're going to take physical perfection and slot a +End proc in it as well.