10:1 is OK for a CR based on stroke volume. Measure with oil and a small calibrated 5cc syringe.
reduce the squish clearance to less than 0.020", preferably to about 0.015" if you want to take full advantage of it. Transition from combustion bowl to squish zone must be sharp, without radius.

I advise you to do some reading on the subject. Jennings is a good place to start.