A Hyper City bike from Walmart (Ultra Cheap): Cadence assist seems all on max; speed being determined by the assist level selected. Impossible to maintain pedal speed in #3 (max assist). In order to maintain assist in #3, one doesn't need to pedal at road speed; just a few turns of the crank every second or so keeps it humming. Is this normal? I would rather have an assist that reflected my input. My other bike has a torque sensor so it is not subject to this behavior. Thanks for any comments or suggestions.