Your fine bro, it was my descrip that was worded a bit cryptic. Keep the premium gas in there as it sounds like you are OK with it's cost and sub in a lighter spring for one of the springs currently in there. Keep going lighter and lighter till it just pings (talks) at WOT up thru the gears then go back a bit heavier. You NEVER want to allow any detonation to occur (except for a few seconds during testing) but you want to be fairly close to it. With 9.7 & I'm assuming that is a measured 9.7 and it ain't talking with regular tells me that you need it to come in much quicker