I'm not even sure what you're going for with the build, but without making massive changes everywhere, simple improvements that could be made are:
Strength of Will doesn't need endurance discount, so save yourself the cost of those Hami-O's and just slot it for Resistance with IO's.
Reverse the slotting in Fast Healing and Health. Fast Healing gives more base bonus, which means it benefits more from being enhanced, so it should get the highest +heal enhancement. Stick the uniques into Health.
Reverse the order you take Stamina and Quick Recovery, so that you keep the better one when dropped down to level 15. Also, slot a third Performance Shifter at least in Stamina, where you only lose 0.07 endurance/second recovery, and gain 1.88% HP.
Switch that Quickfoot Runspeed for a Microfilament Exposure. You'll lose very little speed, and use 0.12/sec endurance less.
And throw a FF recharge proc in Foot Stomp instead of that Scirocco's.
Overall though, I don't get where the build is supposed to be going. I'm far from an expert and still figuring things out myself, but I don't see any areas where it's particularly strong, but it doesn't look all that balanced, either.
And then there's the two purples in there. Ok, they provide an accuracy/recharge combination that you can't get out of a level 50 enhancement in the other sets that fit in those powers, but I can't really picture the expense being worth it instead of slotting say, a Mako's Bite triple or quad, and a level 30 Debilitative Action accuracy/recharge.
Just promised someone to post it on here.
Please give me some opinion too.