Also, I am not really fond of that dogbone bit that you have posted. The way the mouthpiece attaches to the shanks is not ideal.
I know you don't know me, or any of us, from a hole in the ground, so I'll introduce myself a bit. I raise QH's and Appies and start a lot of young horses. I do a wee bit of speed events, going to the provincial gymkhana club finals last year & placing 3rd in poles.
It's hard to do an evaluation from just a few written posts, but I would start with getting your horses teeth checked.
Next I'll ask, what are your cues going around the barrels? Where is your hand? Do you lift the rein or pull sideways?
Does your horse react the same with his mouth and body when doing a turn not around barrels?
Does he move his shoulders away from leg pressure?
Lots of questions, I know, but it can be so hard to help someone over the net.
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