There is a lot of talk about measured compression ratio, cam duration, cam profile, ETC.
Why no mention of cranking RPM? A used starter, compared to a good fresh starter, and fully charged battery could possibly change the compression tester readings 20 or 30 PSI. A more accurate test would be a leakdown test.
If your rings are adequate, but not good, probably be better, as in more horsepower, and torque, AND better fuel economy, by putting new rings in the engine.
But that does not sound as "sexy" as a "high performance 3/4 race camshaft with chrome valve covers, and Super Thunderbolt high energy ignition coils"