Have you made any changes to the exhaust system? Adding a PC won't have much effect if you are still using the stock exhaust. If you replace the headers and exhaust (or just replace the can), you may *need* a PC to give you optimal performance.
It's not about new shocks - it's about dialing the suspension settings so that the bike offers optimal performance - keeping the rubber on the road and improving stability in all positions (straight ahead, diving into curves, accelerating out of curves, etc.)
Mike, there's a post around here from 87gsxrnut explaining how to setup your suspension. When you pick up the bike, they probably left the factory settings, which are set for a smooth ride for a small japenese person. If you are a bit bigger and heavier, you should adjust the suspension asap. When it's setup right, you'll notice - it'll make you feel more confident, since it will keep the rubber in contact with the road as long as you don't try to violate the laws of physics.