Actually that's about all I use my Turtle Fins for now is sump dives because they fit over just about any pair of caving boots I've worn. The DiveRite fins won't (nor will the XXL Jetfins), although they work great with my drysuit booties.
The limiting factor usually appears to be the height of the foot pocket. By the time you allow for a thicker sole, all the material around the lacing etc... it won't fit. But then you probably have petite girly feet too.
You can make it work either way, it's just a PIA having to change your footwear multiple times in the cave. Simpler just to slide the fins off and clip them to your pack and go.
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