10.1 is not the max it is just the best all rounder for a street engine. 10.5 is still ok but you have to be a little more careful. Cold intake temps etc for hot driving days. Also you can retard the timing a little but you will lose the gain of the higher comp. Fuel injected engines can run good compression ratios because the air and fuel is mixed precisley plus alot have anti knock sensers to stop any pinging.

I have around 10.1 and the main difference I noticed was and increase in torque over standard.