So, when I ride in my D ring snaffle copper roller bit, my mare tends to get strong and quick. I used to ride in a full cheek snaffle with a copper mouthpiece:
...but it didn't quite fit her right so I bought the D ring:
Shortly after switching, her brakes began to malfunction. It wasn't bad at first, if I corrected her or did a strong half halt, she'd usually come right back to me. But it progressively got worse and worse till now, when I jump in the D ring, by the end of a course, my arms feel about ready to fall off. I work on transitions at the walk, trot, and canter, do serpentines, trotting and cantering poles, etc. She used to try to gallop at the canter, but now her flatting is back to normal, no matter what bit I use. But jumping, she rushes unless I use my Happy Mouth Snaffle Elevator bit:
Now I would think that because of the added leverage, she doesn't rush or pull, but the strange thing is, I can ride on very very light contact with the elevator and she won't pull at all. I can ride with such light contact, that it's probably about equal strength to a regular snaffle. I'm wondering if maybe the bit is the cause of her rushing?
She used to be a horse I could jump bridleless with (pic from 2007):
And I never worried about rushing. But now, it's like a different horse altogether.
When she gets bad, I stop her, back her up a lot and make her jump from a stand still and after a few times of doing that, she usually stops rushing, but I'm not sure if that's because by that time she's gotten tired or what. By the next time we ride, it all starts up again.
What are good exercises for horses that rush? Any suggestions for me?