I love when these threads get techinical. I am given insight and thoughts I didn't think of before.
I can attest to rejetting when raising compression and timing, I had to do it myself. As a matter of fact, I have to rejet now because it is getting warmer outside, but not in the direction you would think. I have to jet BIGGER. I know, it sounds crazy, or maybe I am crazy. But with the warmer weather my bike is running hotter.
Of course, like an idiot, I never rejetted when I switched to AVgas, so its going to be like starting over.