This just sounds to me like what happens when you go to a much easier gear on steep terrain. You’ve increased your torque at the wheel for a given pedal force so the pedal will spin quicker through that spot. But when you’re in a bigger gear you become torque limited so you have to apply that force through a large arc of the pedal stroke. So the super small gears can start to feel a bit ‘stabby’ vs the ‘grindy’ of the slightly larger gear.
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