Can't you just add a Low Voltage Cutoff to it, I saw this ad at Horizon Hobby for
an Auto LVC unit. Would this Solve the over-discharging problem? It's like $19.00.

FMA’s new Auto LVC unit gives precise cutoff functionality to ESCs that weren’t programmed to properly detect low voltage with Li-Po packs. Users can also customize the cutoff point using a voltmeter and a tiny switch on the unit itself. Works with equally well with brushed or brushless motors.