I own a 15 year old thoroughbred mare who really knows her job. Her only problem is that when she jumps or changes leads (anything to do with her feet off the ground basically) she bolts forward. She loooooves to jump. Today I tried a straight bar uxter kimberwicke on her and she did fantastic. I feel it was a bit too strong though and she overreacted to my asking for a slower pace. My other worry is the constant pressure that a straight bar is putting on her mouth. I'm concerned that I'll lose her fragile mouth if I use too strong of a bit for too long of a time frame. I'm simply looking for a bit that provides a little more leverage for some brakes. I've been considering a plain jointed pelham but if anyone has any ideas, that would be great.
Also, would anyone advise against using two bits for two different areas of riding? Or is it better to stick a horse on one consistent bit for everything? I use a plain D ring snaffle for my second level dressage with her and I don't need anything else for it but the jumping is an issue.