I love the sprenger bits. Bomber bits also make some super bits for very soft mouths. My go to is always a straight bar snaffle or a very fat loose ring snaffle.
French link snaffle (make sure it's a proper French link, not one with the flat plate in the middle, which isn't actually a French link, but I forget the name)
Double jointed happy mouth d ring
Or the KK bits
French link loose ring snaffle.
Double jointed loosering or a Mullen mouth.