well my first thought was, wheres the music? ha but other then that everything looked pretty good. smoother style just comes with doing it more really so if you just keep riding how you're riding itll start to look better.
there were a couple times it looked like you where looking more towards your feet then where you were going on the feature which makes it so you have to force switch ups and spins around more which is prob whats causing your arms to swing around like that. for the most part its better to lead the spins by looking over the leading shoulder until you see where you wanna stop then just focus on that. a lot of people dont realize how much where you are looking with your eyes helps with spinning and not just throwing your shoulders as hard as you can.
good switch ups come from upper and lower body separation where youll start spinning your upper body and keeping your lower body in the same position then let it catch up with the rest of your body.
of course though there are many different ways to do a lot of the same things and just gotta find what you like best.