Gigslut-
I actually used a very similar "claw" playing style for quite a while. I had to learn to play differently when I started having a lot of pain in my right wrist and tingling in my fingers.
I now use a "modified claw" where my hand is flatter so my wrist isn't bent as much, but I still make most of my movements with by bending my knuckles instead of dragging my fingers.
Actually, it looks a lot like the pictures you posted. I've tried other things, but this works best for me.
It's gotten the same responses from those who claim to be better trained than I am.
Everyone's a critic.
I used to really curl up the hand, and I did get cramping if I played a lot of consecutive gigs. I suppose I've flattened out the hand a bit to alleviate that. It must have been subconscious, but I can see it after comparing older pics to my current technique. I still get comments from the experts, though. It works for me because the right hand doesn't have to move so much. It can pretty much stay put and I can reach any string from where it sits. It's actually similar to a classical guitar hand position, and even use my thumb occasionally for the E string.
I've recently become acquainted with some well regarded jazz bassists who are faculty members at a couple prestigious Universities here. While they have observed and commented on it, they are not nearly as judgmental. as one of them put it, "whatever works ..."
