Definitely check the valve clearances. Everything you describe sounds like a valve adjustment is needed.
By the way-my HF compression tester started showing 60psi & lower on good running motors after about 6 months from purchase/use, I know it's not accurate now as I tested a new engine (it tested 175psi @ shop) and a known (hasn't been running engine) test that was 110psi. I can't explain it but a motor shouldn't run below 60psi very well!
Last edited by metalstudman1; 06-19-2021 at 08:05 PM.
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