I tried going back to the #1 base setup for my carb but it stumbles on part throttle acceleration, so I went back to 4% richer to eliminate the stumble. Once I burn this tank of premium, I'm going to put some 89 octane in, back down the timing 2 degrees and see what happens with the plunging. It's supposed to be in the 90's here this weekend, so I can do some more testing after I change fans.
