See the first link in my sig. I think post #6 or 7 has the compression test chart of what is normal and what is failing. Have to get the RPM of the test and the lowest of the 6 face numbers and see if it is above or below the failing line. Or if any 2 faces on 1 rotor differ by more than 1.2

A failing score at 300rpm can be a passing score at 200rpm. It's not just 1 single number.