Richard has a point about carbon -vs- sharkskinz. When you talk weight, carbon is the best, however should you ever drop your bike get ready to replace those nice carbon parts parts (they are quite brittle).
Sharkskinz are way better when it comes to flex. They also do not crack/spider, the price is also fair.
If you are looking at weight reduction here are some ideas:
1) full ti exhaust.
2) mag or carbon wheels. ($$$)
3) body (replace head light assy, mirrors).
4) 520 chain/sprocket conversion.
5) remove misc stuff (weights, grab rail, foot pegs, etc).
6) calipers & rotors. ($$)
7) ti bolt kit & axles ($$).
8) trip. clamp & clipons.
9) carbon or al fuel tank. ($$$)
10) Ohlins forks/shock. ($$$$)
You can get into spending serious cash on some of these things. My bike on the scales was 464 lbs. back sometime last year. Rad Greaves racing busa tips the scales around 409 lbs.