is 11.2:1 compression too much for 91 Octane

But tighter LSA increases cylinder pressure and cranking compression thus more likely to detonate.

Pressure is only one peice of a potential detonation problem - and it's not the most important one IMO. I never said the choice was to decrease cylinder pressure, my point in mentioning was simply to note the differences.

P.S. - I happen to like Comp Cams... In addition to a bunch of others... lol.