Hackamores work magic as well
Sit deeper and also I don't know if western bits have this but if they do try a corkscrew or slow twist
So back and wiggle your fingers on the reins
I don't ride western either i say sit deep take ur leg of and don't tug on the horses mouth but half halt
I don't ride western but maybe try sitting deeper in the saddle or keeping your legs off? Also are you allowed to check and release the reigns at all?