Not speaking about the v-bend, the bending in foot-pockets is not a problem as long as the blade maintains the optimal angle of attack, which is definitely not the case in the picture of Ben's fin, where the blade is almost at 90 degrees to the axis of motion. In contrary, the photos of your fin look just right.
Both, bending in one point (at the foot-pockets), or continuous sinusoid bending of the entire blade, have their advantages, and I think it is difficult to tell which principle is better without making very complicated measurements.
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