Okay, finally picked it apart and was able to salvage a few minutes from the video. You can see his trope steps best at 0:40 and 3:30. He's 100% sound and was examined by a vet for a pony club demonstration last week.
From watching the videos, I can also see that I *really* need to allow him to have a bigger, more forward stride at the canter. I'm really holding him back with my seat because he feels too fast, but I have to trust him a little more with the pace, lol.