yello20wrx02

i am running a vf30 with a cold air intake, turbo inlet, up and down pipe, greddy bov, full exhaust and a greddy profec b spec 2......... now my problem is when i adjust my boost controler gain past 5 it makes a screaming sound out of the turbo around 4500 to 6000 rpm then it stops almost like fuel cut my settings are not spikeing and im only hitting 12 psi because i dont have a reflash or fuel support.. these r my settings 5 on the gain 56 on the boost and 66 on start boost!..... any suggestions?????