It depends on what they do to the fence. Does your horse rush and stick their head up? Or do they put their face down towards their chest? I’d consider a 3 ring gag or a straight bar rubber Pelham. Those prevent leaning on the bit. But most of your problems won’t be solved with a bit but with ground work and lots of transitions. So like put poles before and after fences. Or if you’re in a line, jump one fence with poles then like 5 strides, stop. Walk them to the next fence, then circle back to the second fence that should also have poles. But more transitions! Like trot/walk, walk/trot, canter/halt, walk/canter, canter/trot. Change It up constantly until they’re really listening. That’ll help a lot more than a bit!
@zcandrews they are apple scented which encourages the horse to accept the bit as well as being polymer which is nicer for horses that metal that can change temperature. I found that my mare that can be extremely strong has a soft mouth with a happy mouth bit xx