Hi guys I'm having a bit of trouble finding a suitable bit for my cob. He has been tried in a loose ring Mullen snaffle, a French link eggbut, a 3 ring, a Pelham and is currently in a cheltnam gag which is the best we have tried but he still doesn't like it! He pulls like a train and always has his mouth open even when I have no contact at all. His back and teeth have recently been checked and he's all good. He's obviously not happy in a bit so I was thinking of trying him either bitless or giving a sweet iron with copper ribs a go. If anyone has any suggestions of bits to try I would greatly appreciate it!!