I had good luck with sending out my stock head to RK tech for machining.
Your best results are going to be taking a squish measurement and talking to a good machinist about tightening up the squish band and getting the dome cut for the fuel (or compression ratio) you prefer to run, as others have suggested.
Higher compression will give you more power low to mid and take away some over-rev. The caveat being you will need to run higher octane fuel. Worth doing IMO with the 250 in some cases, probably not needed with the low-end torque of the 300. Unless you ride at high altitude.
The biggest benefits are getting the squish band correct, which makes for a more complete burn of the fuel in the combustion chamber and makes the jetting more tolerant of altitude and temp changes.
My 2 cents. There are definitely guys on this site with more knowledge than I have....
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