@MarkT Normally, Motor 2 is connected to a leadscrew, while Motor 1 is driving a wheel directly. The thing that throws me off is that Motor 2's direction changes are the cause of Motor 1's stalling.
@groundFungus I would like to leave the wheel on Motor 1 driving directly for simplicity, but if it's possible that it's leaving itself more susceptible to resonance peaks of the other motor, I suppose I'll have to find out the hard way after I install new drivers and a higher voltage power supply.