SR20 loses power in boost, but not all the time

[rpierce]

I'm having a weird problem with my redtop SR. It seems like it loses power under boost every once in a while, usually after i drive it for a long time and it gets warm. It still builds to full boost but it feels like it's going nowhere. It doesn't cut out violently or anything but if I let off the pedal and go out of boost I can feel it get it's power back.

Sometimes it'll go away for a few days entirely and the car runs great then it'll come back, which is making me think i keep fixing it, just to be sorely disappointed the next day.

As a reference I'm on stock redtop everything with an FMIC, Isis fuel pump, Z32 fuel filter.
-I borrowed good coilpacks from a friend and switched those around but it didn't fix my problem.
-Boost leak tested from hotpipe to intake manifold and didn't find any leaks
-Tried spark plugs at both .028 and .032 gap
ECU is throwing no codes (AKA code 55)
I've done other things I can't remember at the moment too.

I'm starting to run out of ideas. I'm thinking at this point borrow an ignitor from my friend and change temp sensor and maybe knock sensor.

Has anyone here had a similar experience or have any advice? Thanks in advance.