Just did a compression test. From 127 to 135 psi on all.
One odd notice is that all plugs on drivers side are black from soothe but all plugs on passengers side looks normal brownish
Weiand dual plane intake, tti headers, 2.5” exhaust, MSD distr w/ vacuum advance
A compression test can be misleading as it will not tell you what the rings are doing under load (Combustion).
Sounds like your issue is probably on left (drivers) side. A leak down test may help but it's only going to confirm what you already know. Its tear down time IMO
