Well isn't that strange. I didn't put much thought into it, but I definitely noticed it.
When we do a dealer's riffle, we just push the cards together and it works great. When we do a typical shuffle (or what I call an overhand riffle) we bend the cards at the end into a bridge, and they're all supposed to come crashing together nicely, but with these Angel's, they don't.. So maybe the texture on these cards affects how they flow together when they're bent?
I don't know, this is strange. I've probably shuffled 15 different kinds of premium plastics, and this is the first deck I've noticed that quirk.