Is your reverse actually running the motor backwards?
If it is, can't you just run the reverse circuit off less voltage (only using part of the pack) to slow it down? I shouldn't think that using part of the pack for only a second will actually affect the pack's differential discharge any more than just using it would...
If you're still spinning the motor forward, again, is there a way that you can put Reverse gear with a switch/sensor that when the reverse lights are on, it cuts the voltage/current in the controller so that it can't spin up as fast?
Then again, can't you just use less throttle?
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