Your Tack Shack is adorable! I love it!
Went riding today and my gelding was a freaking BRONC. Well, not a terribly effective bronc because I stayed on, but after I got home and was still for a while, I discovered he had jacked me up. My left sciatic kept wanting to drop my leg out from under me and my lower back was soooo tight.
He would get head sling-y and crow hop a bit. I have him in a snaffle right now and I'd take his face away and he'd stop. Sometimes me just saying "Aaaaant!" would make him stop before I could pull one rein. But he kept doing it! Probably 8-10 different times. I checked the saddle and the pad and girth were fine and then I made sure his skin laid smooth - no wrinkles or bumps.
We figured out he didn't like having to 'work' to keep up with my friend's faster gaiting Rocky. If my boy was in front and controlling the speed, he was happy. If he was behind and having to work to keep up, he'd get pissy and have a tantrum. Other than that, he was a good ride.