When would it be apropriate to use a Kimberwick bit? I just started Jumping my TB and he's gets quite strong over the fence and after landing. Right know he's in a loose ring snaffle.
NO, hold the loose ring. Retrain. Type it in on here or www.google.com or try www.ponymag.com - they have loads of this type of thing.
I agree with others who suggest you work on your riding skills, and his training, to return with him under control.
But if you do have your heart set on a kimberwick, opt for one near no port. Going from a snaffle straight to a kimberwick with a port is a huge step.
Anytime the bitting setup you are using is not working anymore you should try something different - including training because it is not always the bit. The problem could a short time ago be the horse or rider need more training.. The Kimberwicke is not necessarily a harsher bit.it just works differently than a loose ring snaffle. It employs a curb cuff to place some leverage under the jaw. It also applies poll pressure. A Slotted Kimberwicke also gives you two option for rein placement.
I prefer Reinsman bits: They offer lifetime guarantee, they use sweet iron mouth pieces and I know they make very dignified quality products. I own several Reinsman bits already.