Your prolly seeing so much boost because your not flowing the air as much as you should be through the motor. 3.0 on genV = 2.8 on genIII. IIRC you need a cam and full size IC to run that small of a pulley with an agressive tune. You are prolly running very rich and low timing to keep your KR down. My guess would be to pulley up and get re-tuned and you will run faster.