First of all, there is no such thing as a snaffle with shanks. A snaffle has a 1:1 pressure ratio, as in, for every pound of pressure you exert, the horse feels one pound of pressure. With shanks, you get 1:3, 1:4, etc, depending on the length of the shanks and purchase. This is because, in a shanked bit, a horse feels more pressure than you exert. A mullen mouth can be a snaffle because, with no shanks, it's a 1:1 ratio. Second, the problems you are having with stopping aren't from the bit, they're from lack of training in the "stop department." If you try to move to a shanked bit or any harsher bit, it may help for a while, but eventually your horse will go back to how he was because it's a training issue. I would stay in whatever bit he is the softest in, and just working on training. First, make sure he is VERY responsive to "Whoa" on the ground. Then you can move to the saddle. Lots or walk/stop and trot/stop transistions. Hope this helped.
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