Yoyos get a bit too big for your tank, up to 6 or 8 inches (I've seen them for all you doubters) Maybe sidthimunkis or striatas or even kuhlis, although not all will eat snails. I still have snails in the filters of my loach tank.
Instead of loaches you could try removing them with a piece of lettuce or food in a small-necked container left overnight. Cut back on feeding to help control them too. Or try to squish them like msj. said, maybe the angels will learn to eat them.
Instead of loaches you could try removing them with a piece of lettuce or food in a small-necked container left overnight. Cut back on feeding to help control them too. Or try to squish them like msj. said, maybe the angels will learn to eat them.