you need to make some measurements like squish clearance- more comp often gives better throttle response and a bit more bottom- if you go too far, you will need race gas and the bike can sometimes run a bit flat on the top end.
IMO your best bet is have the whole topend and head ported?modded by eric gorr- his prices are real good and this wont cost much more than some places charge for a simple head mod- he can set it up for your specific powerband, fuel and altitue needs