Quote Originally Posted by 36 sedan View Post
Read your plugs, they will tell you if detonation is present by specks on the porcelain (or worse melted). The plugs will also tell you your tuning.

Leak down test is a must do.
JMHO, your compression test shows a problem.
I've done a lot of reading on this and can't seem to find an exact answer, but cylinders within 15% of each other seemed to be the general consensus for acceptable.

A leak down kit has been ordered and I'm sure will give some results to consider.