I have an 11 year old quater horse gelding who is very hard mouth. I just recently purchased him after working and caring for him for about 9 months. The previous owners had him since he was 2 months old and he has been through tons of trainers (western). When he got home from the trainers, the owner would do NOTHING with him exercising/groundwork and just let him do what he want,pushed everyone around,etc. He was pastured with 3 other mares. He became the boss and became very very buddy/barn sour. Because of him being so buddly/barn sour he became impossible to ride, and because of that the owner or whoever was riding him always was in his mouth trying to control him. He was ridden in a light snaffle. I began working with him on the ground but could never do much work in the saddle due to lack of area to ride. Well, I fell in love with him and the owner wanted to get rid of him. I took him and found a trainer to board him at. First day at a new location without the buddy/barn sourness and I was riding him. First time being ridden english. He has been here for about a month now and is doing wonderful, he is like a completely different horse.
Anyways the trainer here told me to use a uxeter kimberwick (not jointed) and to put the reins in the bottom slot. I heard some very negative things about the kimberwick and heard that it doesn't really fix the training issues. All I know is that he is no longer buddy/barn sour because he has no buddies and I am always working him by and away from the barn and that he is doing fine in this bit. I am moving him and my pony to my property that we just recently bulit a barn on with a small arena and a few paddocks, and I really want to see if I can switch him to a snaffle. I know the training he had in the past they used a snaffle. Should I just stick to the kimberwick or see if he will respond to a snaffle? Also is there any way to reverse hard mouth horses? I know I am using a kimberwick but I try to be as soft as possible with it, I'd really like to switch him to a lighter bit.