Most of us GTR boys don't do awd dynos, we drop our front shaft, and go on a RWD dyno...
My RB26DETT stock motor/ecu, with adjustable cam gears and an exaust, boost uped to 1bar (~15psi) pulls about 280rwkw in shootout mode, which is considered good on standard turbos/cams etc....
Maybe you have adjustable cam gears? where do you find boost coming on full?