Never really messed with a fmu but here is the set up.

lsvtec bottom end is sleeved to 83 mm , arias 9.4 pistons, eagle rods etc.
Stock injectors, gsr obd 2 ecu, Vafc, walboro 255 hp, vortec fmu, garret t3/t4 57 trim. I will eventually go stand alone like my other car, but this pittily **** confuses me. I have the vafc set at zero for high and partial throttle. when i run hard boost it cuts out at around 4500. Am i getting too much fuel? is the vafc causing this although im not adding nor subtracting fuel.
any help would be appreciated my wife would like to enjoy her car.