Hi Ben,
I agree with Dave, it's bending much more at the footpocket then the blade itself, I have photo's of my medium stiff leaderfins hyper doing the same thing. The new generation fins are prone to this because the footpockets have a lot of rubber or foam between your foot and the blade. Compare this to the old waterway and your foot was sitting directly on top of the fibreglass blade. The bending at the footpocket is going to be worse as the blade is stiffer it puts more load on the footpocket. I haven't seen photo's of my soft leaderfins hyper pro, but it doesn't feel like it's bending thru the footpocket anywhere near as much as the medium stiff one. The leaderfins hyper and pro also has the foot very far back from the blade, this probably makes the problem worse too. To reduce the problem you would need more reinforcement between the footpocket and blade, and perhaps very thick fibreglass on the footpocket side of the blade. They really need to do it at the time of construction, don't think it's an easy DYI fix once you have a fin.
These fins are designed for finswimmers and not freedivers, I think with normal finswimming technique you wouldn't notice the footpocket bending as much. Of the fins I have tried for dynamic the ones that seem to be the most efficient are larger and softer blades. The shorter stiffer fins performed much worse.
Cheers,
Wal
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