Very occasionally I will get the sort of cramp that twists the ends of my feet and toes - as you say, to a funny angle :shock: . But I don't get any sort of cramp very often, and certainly no more frequently when I'm low carbing.
How's your salt intake in the hot and humid weather we've been having? My rule of thumb is, if the sweat on my upper lip doesn't taste salty, I need a little salt. For me that's just adding a little bit to my food, which otherwise is completely free of added salt, even in cooking.
Hope that helps
Viv 8)