On the original question, another vote to go to a pelham before a kimberwick. Much prefer the ability to control how much curb action you are using that two reins gives you.
Originally Posted by jumanji321
It's not that she's hard to stop, she just resists the bit the whole time. She really softened up tonight .
I am not sure going to more bit can equal softening and not resisting the bit when we are talking about bits with contact.
I can see how it would feel like that because with more bit the horse is easier to make do things.
Have you considered looking into changing from a single jointed bit to something like french link or other double jointed bit? Or maybe a solid bar mouthpiece. Some horses just do not like the way a single jointed snaffle works in their mouth.