If you want a personal mechanic, there is one waiting for you at your local Kawasaki dealer for $80 or so per hour. It's money well spent if they can sort out things like jetting problems... their experience was hard won and valuable.
To fix your 220, sell your torque pipe to somebody with a 200 or the Eric Gorr 225 kit (my setup, working nice with the torque pipe) and get a rev pipe. I personally think the carb mods beyond jetting are dubious. I'm sure some people swear by them though. Boysen reeds seem to make a difference off the bottom, and are cheaper then Kawasaki reeds anyway. I rode a 220 with a Boyesen VBlock thingy, a Pro Circuit rev pipe, and it was a *very* nice running bike. My 200 (now 225) just has the torque pipe and boyesen reeds with the factory reed block. Once the jetting was right and the bike was broken in, it runs great and pulls hard.
To fix your jetting, you are going to have to buy a bunch of jets and start experimenting. It is quite a learning curve, but it is doable. For me the biggest learning was that jet effect is mainly relative to throttle position, not current RPM's. I dialed in the low speed jet first, then the high speed jet, then tuned the needle clip position. I used the FRP offroad recommendations as a starting point, and they were close.
Each bike in each location in each set of conditions will have a little bit different jetting to run right... so you will need a few jets laying around anyway.
Oh, and is that the stock piston in there? If so, get it out of there and put in a Wiseco... easy job. It's a grenade waiting to happen.