not sure I fully understand this, but when I ordered up my last Bullet cam they told me cranking compression was free compression. You go by static and dynamic compression for octane requirements. I have 195-206 cranking compression and run my timing at 36* on 93 octane shell with no issues. I'm now thinking next time out I will try 40* and see how it likes it.
The shell v power 93 is the best pump gas we have here and smells like race fuel when I fire the car up in the garage. If you have it in your area you should give it a try with your pump gas engine.