Yeah, bouncing. I have problems with it whenever I take a break from riding. It didnt look terrible, just an area to work on.
It's not the mouth piece that matters, it's if it is a curb or snaffle. Because of the cheek pieces (and I'm fairly certain, but I may be wrong) and depending on your curb strap, I wouldn't consider it just a snaffle. It puts pressure on the sides of the lips, roof of the mouth, underneath the jaw (if you have a curb chain) and poll. So you would want to use one hand. They're not really meant to be ridden with contact (I use one when running my barrel horse) as they CAN be severe. I quite like gags as my horse goes great in one too, but for training, I'd rather see a snaffle. (D Ring, O ring, Eggbut, etc. Not just a jointed mouthpiece)