You seem to have ur motion down pretty well. I will say those can be hard on that short of a rail sometimes, because when you can spot the end of the rail the way you’re supposed to after your back swap, THEN throw the spin, I feel like it’s a lot easier to throw the b2 around bc your upper body has a lil more momentum.
a quick head whip back to your landing when you throw that pretz 2 is key i feel like. That’s what works best for me at least. You can’t hesitate you just gotta whip your eyes and shoulders back around once you’re locked in and looking at end of rail.