This move is WAAAAY harder on spin. Especially to get it as big and floaty as you can on static.
It’s just physics. You are spinning much faster on a spin pole, because you have your momemtum PLUS the motion of the pole itself spinning. And the faster you spin the harder it is to hold on. Fact.
For a reverse grab, you need a lot of momentum to avoid banging your hip into the side of the pole. (You will hit your hip even on a static pole if you don’t throw you weight out and round enough). To get this momentum on a spinny pole, you’re going to have to deal with the extra ‘speed’ (it may not feel faster, because you’ll probably just slip right off before getting into the spin, but as I said before, the pole’s spin is adding to your existing speed)… and thus you will have to develop the extra tight grip required.
You can alternatively go for a less dramatic RG, and grab your free hand behind the pole much sooner than you normally would, and ‘lower’ yourself into the spin instead of swinging into it. Hard to describe, I hope I’m making SOME sense at least haha!