One more thing that I haven't seen in the replies to your post.
Looking at your piston (in the attached photo) makes me think that you might want to do a top end job. The piston is streaked pretty badly. If your rings are also streaked, then loss of compression may be where your power went. A top end job might be best to ensure that your cylinder stays in good shape.
Are you carefully warming your engine before loading it hard with the throttle?
What oil and jetting are you running? My bike is in it's fourth year, and it has yet to scuff a piston like that.
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