This seems to be a pretty common problem, as I am going through this as well.
My daughter(almost 11) wanted to do western in 4H but couldnt show in a snaffle, her horse neck reins at the walk but loses it at the trot. She decided to do english this year and we are still working on the neck reining as she still wants to do western. We havent changed his bit yet, I do like the billy allen bits but they are hard to find. I am not looking in the right place perhaps? Also looking for a full cheek with a copper roller. I know these bits are out there somewhere...just not in my towns tack store...
Horses and children, I often think, have a lot of the good sense there is in the world.
Josephine Demott Robinson Feed, muck, groom, ride. Repeat daily!