The only issue that i can figure is that the standard computer is fighting your SAFC, as my car was dumping timing and fuel with anything over 10 psi.
This maybe the same problem that you are having as my dyno graph looks terrible before i had it tuned correctly with the AVCR and great up to 10psi but all over the place again after 10 psi.
Luckily enough i have a power fc waiting to go in the car to remap everything, but i was told if i didnt have this a could go down the path of a FCD to fix the issue but it was not advisable.