Something I have experienced which really determined how fast an engine is going to be is the fit of the sleeve into the crankcase.
I have no way to explain this but when the sleeve fits very tightly and it is almost impossible to get it out, the engine is very fast and lasts a long time.

I have had three engines (JP P3L tuned, RB R3 RC, and MF12) which had an extremely tight fitting sleeve, the sleeve of the RB is the worst need to heat the engine before I can get the sleeve pried out with a screw driver.

I had two engines with a very loose sleeve (JP eagle tuned, RB v12 rody) and both of them were paperweights, no power and completely useless.