To me he was galloping faster not slower than the example horse and I too agree that that one looks like more of a canter. Yours looks like a lovely hand gallop though. If your looking for something new to work on with it though, might try working on a little bit of collection. Jerry seems to like pointing his nose out, tail up, and enjoy a good run but collection could also help you keep his control and attention when he feels like getting overly excited and bucking.
"Blame it on my wild heart."