does anyone know of anyone making fitted fins ? either from molds or left and right seperate. i see the sporasub fins. looks interesting but not too durable possibly. i was thinking more along the line of more exact sizing with left and right sides, possibly even from a mold or something? i am getting blisters on my toes, i have had a few different fins so far and they all rub,(cressi 2000 hf, omer millenium, and now cressi professional) i try to wear sox but they rub too. anyone got any ideas?