I do have the compresson bumped up a little by thinner head gasket but probably not enough to change things too much. about 0.040 thinner if I remember right.
I think a guy could shave the top of the cylinder and the head and still not detonate the engine running alcohol but you will have to be very careful not to let the piston slap the head and I ran into just that problem when I was upping the compression by head gasket changes.
I did find that the lean running was caused by a air leak on the intake manifold with a 0.067 mainjet but I still went back to the 0.026 and the 3 to 1 mix anyway just to get rid of the alcohol mix. I think maybe some increase in performance but is it worth the headache of mixing fuels?
No is my answer cause you have to have an alcohol compatable oil if you make a premix for an engine using alcohol now if you go 3 gas and 1 alcohol I don't know what the oil will do as I'm using a syn that has castor oil in it and will mix with gas or alcohol. Regular premix oils will bead up in methanol alcohol and not mix.

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