I well say,using turn by turn gps just makes u stupid. I use google maps,just i did with paper ones. This way helps u learn the area ur in. My wife uses turn by turn and makes wrong turns. She cant go anywhere out of town without,even places she has been several times
Shaved head may up compression ratio to a degree. Higher octane helps reduce pinging. Too advanced timing adds to pinging. Verify running temp with temp gun or other quality device. Do this before any thing else, Oem gauge could b off.
As they say,check the stupid shit first. Otherwise you well just make things worse,ie "melted head"