ORIGINAL: mstam1971
My comment was meant cynical
I do exactly as you describe except that I'm using Amsoil Saber 80:1. DL50, MTW RE2, Vess 23B, 89 80:1 gas, 7200 rpm, 34lbs thrust.
You are not on a stock muffler, that is for sure.
Talk to a few very knowledgeable engine builders and you won't be so cynical
