I have 2 builds with the same issue.
At max speed (limited by KV and battery voltage) the torque output from each motor varies and feels unstable.
I can feel one side pulling more than the other but each side will switch to which is putting down more power and the other side feels to drag or freewheel. It feels like the board is pulling in one direction or the other when this occurs.
I understand that the max RPM at the given battery voltage is being reached. If I reduce the throttle just a little bit I can feel the power delivery being consistent again across both motors.
Same motors, same VESC setting on each, using CAN bus for dual config, ppm remote.
Anyone else experience this?