RB25 crappy throttle response- help

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Alright guys, I recently got my rb25 back in my car and running but throttle response sucks and Im not sure why. Quick list of mods: tomei drop in cams, HKS adjustable cam gear (EX), top mount manifold, precision sc61, tial 44mm gate, front mount, turbosx RFL Bov, freddy intake, q45 throttle body, top feed rail with bosch 850s, AEM fuel pump, etc. running just off the down pipe right now. Im using a Apex-I power fc w/ map sensor and have the fuel somewhat tuned. The car is drivable but my throttle response sucks. Its slow and not smooth at all like the rb used to be. I can blip the throttle and it takes a second for any response. Now I was told it may be that the car needs to be fully tuned, but a friend was able to get his SR running great with a very similar setup and we didn't touch ignition tuning yet on his. We timed the rb correctly and also experimented with adjusting my exhaust cam. 2 degrees retarted and the car ran even worse and would die coming to a stop. 2 degrees advanced and it runs about the same as at 0 degrees. Any input is appreciated as I am dying to drive this thing.
Thanks