the problem with comp on a long manifold carb engine with the std ignition system is that you have no way of achieving the tapering advance curve you need. we have lots of problems with hi comp bikes pinging on the best premium fuel we have, especially the ram/dp kits that have something like 12.5:1. even 11:1 can be an issue.

injected bikes with the shorter intake and tapering advance curve have no problems. i run my st2 on our std unleaded and it has around 10.8:1.

you don't need much retard really, but getting the 4 to 6 degrees you need under 5,000 rpm without generating idle issues is impossible.