If you're hitting 10psi of boost or close to it, don't worry about the supercharger right now. We need to concentrate on a FULL tuneup. You've done plugs and wires and injector cleaner. While that cleaner is working through the system, change your fuel filter and pcv valve. Check your air filter, and consider SERIOUSLY taking off your TB for a full cleaning. Also change your O2 sensor if it hasn't been done in awhile (50k or so).
If you still have a problem, you're no worse off. Your car needs this attention regardless. If none of this helps, we'll start narrowing down the possibilities. It'* USUALLY not serious.