Leaded gas and synthetic oil

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my guess would be that your jetting is off. what do your spark plugs look like. any metal specks on them? does the engine rev freely all the way to the rev limiter? you might want to out a little larger main jet in and see if it runs better. your compression is not that high, pump gas should work ok, my bike has 11.5:1 comp and it is designed to run on 87 octane. when you get to 12:1 and 13:1 you need race gas. your valves will be happier with leaded gas though. run good motorcycle specific oil and you will not have issues with leaded gas and oil. i wouldn't run avgas either. it is not designed for use in high revving, constantly changing rpm, hot running engines. but if you do run it you won't have to worry about it boiling out of the tank when you are at 12,000 feet and climbing
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