Defensive Fire/Fire build - please critique

These powers take me from ~18 to ~32% resistance to damage types that I'm already at the defense soft cap for earlier. This represents a 17% damage decrease from damage types that are already well defended against by Invincibility, Tough Hide, Weave, and Combat Jumping. For comparison, Combat Jumping, a relatively miniscule power, decreases my damage by 43% when I turn it on, since the defense in the rest of the build is so high. In other words, F/C/E/N resistance is not a strength of the set, so the powers which do contribute to it are not a high priority in what they bring to the set as a whole.

I'm sorry, I don't understand why you say this. All 8(!) of my damage powers are slotted for 90+% damage. I'm hitting 110+% accuracy against +3s. (What's the base accuracy against +4s? I may even be hitting the cap against them). I could find some more DamageBuff set bonuses, but I'd end up losing accuracy and recharge buffs if I put them in single target attacks or psionic defense if I put them in PBAoEs, neither of which I think are worth giving up for 1.5% more damage (3% damage increase over 200% of base from slotting).

Yes, I was going for the Accuracy, Recharge, and Psionic Defense in those sets, and the HP and End recovery happened to have shown up in other sets at that level as well.

I actually am missing a 5th Impervium Armor: Psionic Resist IO as well. The reason for this is that if I replace any other enhancement already in a resist power, I end up reducing my resists to another much more common damage type. So that leaves taking slots out of something else, and I can't find any slot that is currently placed, but worth less than 3% psionic resists (especially since most of my psionic mitigation comes from defense, not resist). If you find a slot or two I can repurpose without losing much, let me know.

If u look under view totals/misc buffs u can see that u have only +2% to damage.