HOWEVER what concerns me is the bit. Two things strike me if the pictures are accurate. The first is that the bit is too large for his mouth and the second is that it appears to be hanging way too low.
I noticed that too and I wasn't sure if that was just the angle. Being so low it could be knocking the front portion of teeth in his mouth and although he's not putting up a fit about it, it's probably not very comfortable. The bit should rest gently at the corners of his mouth, there should be no part of the bar hanging out on the corners and there should be a slight crease in the corners of his mouth from bit/mouth contact. If something were to happen and he took of, where it's resting right now would give you little control from my experience. Having it placed correctly makes a huge difference.
Your saddle does look a little to wide but I agree with others a thicker pad should help. I have good luck using semi quarter horse bars on my gaited horses. You don't need a special gaited horse saddle. I also agree his bit needs moved up some for it to work proper and at its best. I use a Imus bit on one of mine and like it. I wanted to add your horse is pretty.