the back cinch caused my horse to buck so i took it off. It wasn’t a big deal because we were just training in an arena. Now she is advancing and i need the back cinch. Should i put it on and just let her buck?

Four years ago i bought a 2 going on 3 year old. I work closely with a trainer who studies with Buck Brannamen and she has taught me a lot. But i have been exploring other trainers and clinicians and have been starting to question the progression from snaffle, hackamore, 2 rein then bridle. I am still using the snaffle, and am ready for hackamore. I question the necessity of it when so many people go right from snaffle to a shank bit. thoughts?