Are you holding the pedal down while cranking? All other plugs out and a charger on the battery? I saw a difference in my psi numbers without a charger but I do have a mini battery.

I got my motor apart n foumd ALL 4 top piston rings came out in pieces and I had 160psi in all cylinders with S2's

 

Yep I followed the manual to a T when doing the compression test. I also did a cylinder leak down on all of the cylinders and they were all within 10% or so. I have read. With larger cams the over lap will cause this. It's just me being paranoid

 

If your leakdown was 10% I wouldn't worry about the compression test, it could just be your motor's static compression and your cams.