Originally Posted by WildVolley
Interesting, and your theory might be correct.
However, if your theory is correct, then you have become too dependent on heel lift in shoes to your detriment. A flatter shoe is actually more athletic as it allows more range of movement with the leg muscles (which is why sprint spikes, for instance, do not have a built up heel). This requires more leg strength and flexibility. I believe a lot of people have become too dependent on the shoe to keep them on their toes, rather than using their own muscles which means that their leg flexibility decreases.
Start stretching your legs after play and try to stay on your toes and see if it makes a difference.
Good points, I thought that was the case (lower = better). I'll try to consciously stay on my toes and see if it feels any different.