Revs are not directly linked to jetting of course, but there is a general correlation since you can't achieve high RPM in a higher gear without the throttle being opened all the way.

Being flat slides also muddies the mix, as you can open the throttle all the way and thus the air intake aperture, but if the air velocity is too low because the engine isn't spinning fast enough, the fuel will not be sucked from the float bowl and you'll bog down.

Once you get the MJ setting right, you have to fine tune to make the rest of the rev range / throttle openings as good as they can be with the best top end.
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