More defined exterior design of sleeves for more reliable grip

Perhaps I'm a special case cuz I haven't seen anyone talk about this, but I eventually stopped using The Handy.
And it was for one reason only. The sleeve always works it's way out of the strap. And yes I have the True Grip Pro Band.

So my suggestion is to extend the exterior design of the edges/wings on the sleeve, to make sure it doesn't go anywhere. For everyone!
Or maybe you can solve it a more clever way.

I hope so!