Hi,
tried many fins over the year and setting up on the: Mares Avanti Quattro plus open Heel Bungee strap fin, as it has a great balance of rigidity and weight.
If you look at the cave diving community in the cenotes 30% of the people will use these fins.
They are light to travel, easy to put in, and you can push through the water with the two sidemount tanks and 1 stage easilly.
If you need to push 4 tanks overall they may be too soft for it.