Your missing a fmic.......
I went through the same thing in my car......I got the PFC by necessity as my afm stuffed up and I decided to get a z32 and pfc while I was at it.
I had pretty much the same mods, exhaust, pod, blitz ID3, z32 and pfc.
Have to admit the pfc DID make a little bit of difference but not as much as I expected, but once the front mount was installed and the pfc had a bit more room to do its magic it made a HUGE difference.
Admittedly the dyno is a bit of a happy dyno...but the difference the fmic should be legit as it was done on the same dyno...
I ended up going from 183rwkw before fmic to 220rwkw after fmic.