Bro the bit is in the mouth and horses mkth is more sensituve than ours. You dont need so sharp bit, i ride on tgick french link, and to horse does whatever i want. By such strong bit youre numbing th mouth over time, so horse is going to need sharper and sharper one. Also why you are using drop nosebands, thay can rupture or break nasal bone! If the horse if comfortable with bit, he will not open his mouth anyway so take that off!