For two drills on 14.4v or 4S, 85A is overkill. For reference, I run a pair of 600w motors off two BotBitz 85A ESCs at 6S, and they could supply the motor with so much current that the motors got warm during a fight, and the ESCs stayed cool.
However. It means that your ESCs are unlikely to blow, so can be recycled bot to bot and allows for any upgrades to better drive you might want to do. The only thing I'd say is put fuses in place to prevent the motors stalling, as I believe TZ85 can supply that kind of current for a drill without blowing, so fuses will prevent you from smoking a motor.