sounds like a transfer issue. I had the same thing with my GTS4, where it was laggy in engaging AWD (i'd get a RWD launch then about a second into it the front would kick in violently)... did a full AWD check from bleeding and refilling the ATTESA system, then pulled apart the transfer and swapped in replacement gears from a GTR... launches really well now, with very little RWD wheelspin, and a smoother transition.
R32's have an 8bit ATTESA CPU wheras R33's have a 16bit, and later models gettin a 32bit one (or something along those lines).
Most cheapie torque split controllers do SFA... its much more fun when you figure out how to drive the car with ATTESA.