Thanks for all the comments so far. It's an interesting problem - one big difference between the older style fins and the new hyperfin style is the footpocket placement. On older style fins (eg Waterways Model 1) the blade ends half way up the foot, whereas on the hyperfin style fins the blade ends near the toe, giving an overall more powerful undulation. However the trade off seems to be that this makes the footpocket the weakest point. There is some sort of metal in the base of the footpocket (aluminum I think) that provides some support but not at the toeline where it is needed.
Interestingly I discussed the bend briefly today with a finswimmer and he said that type of bending isn't necessarily a bad thing if you have an energy efficient stroke. Clearly my stroke is a bit too strong for this particular fin, so I think my options are to start playing around with my stroke or get a stiffer fin.
As a sidenote, I never get that lactic on my max dynamics, I wonder if that's a sign of an inefficient stroke?
Cheers,
Ben
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