Were you running the procharger draw thru?
I switched my procharger setup from blow thru to draw thru and got a ton of surge problems.
My turbo setup is blow thru and has zero drivability issues. There is a huge difference between a centifugal and turbo in feel. The turbo torque hits really early and just stays. My setup uses a pair of small turbos so it is at 10 psi really fast. With the turbos, the more the motor is loaded, the more the turbos come on, with the centrifugal, you need to get some revs going to get alot of power. I think you get a good bit more part throttle power on the turbos too.
97 Laser Red GT-248A Wingless model, Built Lincoln Mark VIII motor-Procharger D1SC, 3 core IC
2012 Black GT-Saddle, 3.73s, Brembos, Shaker1000