LOL! Yeah, I didn't get what you mean by "instantaneous speed", because I got confused by the "free-running speed that's the double", for some reason (I usually think of that spot as "half the free-running speed"). Silly me.

No, what I mainly meant when I said that I didn't understand is the reasons why there are those variations in efficiency when changing the timing, why the peak power isn't constant when changing the timing (just moving at what RPM it gets delivered), that sort of stuff...