What is your piston to head clearance? If your running a .039 gasket & your pistons are .011 in the hole your at the very edge of effective quench.. Increasing gasket thickness could actually be worse... It may sound wrong but a thinning gasket could be your best answer if the piston is in the hole .011-.020... Beyond that & your not gonna help it with a thinner gasket.....
As mentioned tuning & water injection could also help..
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
