Agree with Fast355 that dyno is only way to really measure objectively, but SOTP feel for most is all that's practical.
PlayingWithTBI - Sounds like all-in might be reduced to 30-31* to see if knocks go away. Would be interested in what you notice if you maintained spark at all-in value after all-in RPM; or decreased it, but much less than currently. My bet is not much difference noticed if at all. IMO, the area above all-in spark (that is if at proper RPM), contributes very little if any to HP or torque and is hardly noticeable unless an all out race car on a dyno.
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