interesting. I have been playing around and trying to find the sweet spot recently actually. on longer climbs or wide open areas that stay the same for a long time, ill hold the same gear.. 2nd or 3rd. and ill play around with the RPM. I found that 3/4 or full throttle doesnt help much at all... 1/4 to half throttle actually makes me go faster, and is quieter and easier on the motor vs having it scream and trench, even on uphills. slowly learning and figuring the ol girl out.
I see it in the summer too on tires... guys revving the bike way too high, dumping the clutch way to hard, spinning the tire way too much. low RPM = traction!!
how many hours are you getting out of your 520 set up? piston life? valve adjustments? oil changes?