Braking should almost never be necessary, and it destroys motors. I've had motors die in 20A setups with braking on. Yes you can repair the commutator, but if you let the pitting go deep and you turn it on the comm a lot, you will remove too much material and the copper will begin to come off.
Pretty much all double shooting issues can be resolved without the use of braking. Ensure that the trigger sled is releasing in a timely fashion without a lot of resistance. You can also bend the contacts apart to reduce release distance, and bend the cutoff lever up so it cuts off sooner.
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