Change your gearing smile.gif
Pumped volume of the charger increases with square of compressor shaft speed. So if you look at graph of engine RPM vs boost, it will be an upward sloping curve. You could be making 2psi at half redline, and full boost of say, 5, at redline.
The surge valve opens late, and should be open at Idle. As soon as you exceed atmospheric pressure (what a N/A car would be limited to) and create positive, pressure the valve shuts. Basically you have to wait for you charger to spin up to a speed where it creates boost.
You could try a smaller pulley, BUT you will spin the blower faster, creating more heat, and may throw more heat into your intake charge than desired, killing your higher end efficency. If your setup cannot handle the incresed boost (fuel, motor), than your kinda stuck
Are you aftercooled?