We watched these amazing vids last night before swim class, and they helped me a TON, or at least it felt like it, my lane partners were commenting on my speed, but I didn't feel too winded and their comments surprised me because I felt like I was going normal speed. Basically, I agree with alpinerabbit, in that after watching these vids I'm wondering what 'too much rotation' could be. The film segments in this video are great, and they really emphasize the rotation. Unfortunately we didn't watch the freestyle one, but for the backstroke one I was struck by how they aren't EVER kicking on their back. All kicks are done almost completely 'sideways' very rotated on the hip. I'm imagining it's pretty similar with freestyle.

So I'm wondering if your 'over-rotation' is more of a problem with over-rotating your shoulders as opposed to your hips, which seems to be where the rotation should come from as you swim...

K.