I purchased a Flo-Commander to help get my FCR 41s working a little better on my ZX-11. The transformation was incredible. It fixed problems I didn't even know I had. I immediately began to install these things on many if not most of the bikes I service. So far all my customers are raving about the performance improvement.
It doesn't quite do what you're saying, however. You still have to have the bike jetted pretty close. It will not magically correct all of your carburetion problems. But once the jetting is close, the Flo-Commander will take over from there. It is probably the biggest 'shot in the arm' you'll ever give your bike.