So a dressage guy I just started taking lessons with pointed out something magical today. He said he doesn't think my horse likes the pressure on his tongue that my single jointed eggbutt was doing and that is probably why he chomps so much and attempts to stick his tongue out. So he suggested I try a double jointed bit as it would relieve pressure off the tongue. I have also ridden him in a slow twist single dee bit and a mullen mouth eggbutt with the same results, but I don't believe I have ever tried a double jointed bit.
So I was wondering what peoples opinions are on this, if they have experienced such a situation and finally what is a good bit to invest in?
My horse is very responsive and does not need anything harsh. He is a 17hh Appendix Hunter. Any help would be great.