For my mare that dives, a rubber Pelham was not a good option. Not only did she continue to dive and yank, but she learned how to brace against the bit as well.
I use a regular d-ring Waterford as our jumping bit. IMO, if you’re looking for hunter “legal” I’d stick with the d-ring as I find they hide unconventional mouthpieces better.
Occasionally, my mare gets a tune-up in a double-ring Waterford, one of the Gina Miles bits, if she’s being just plain rude (this mare will yank you hard out of the tack and then fling her head straight up). It’s a harsh bit; the second set of rings squeezes the sides of the mouth. I ride in it with a loose rein and let her “hit” it herself when she dives down. I’ve only had to do a handful of rides in it as the message was received pretty quickly.