After looking at the new pics you posted, I definitely agree with others that you need to correct some things in your left-hand technique to reduce the tension in your hand and fingers. Here's a great video that illustrates a lot of the points that others have raised:
Hopefully making these adjustments will solve your curling-finger problem by helping to relax your hand, but even they don't solve that particular problem they are worth checking out.
Hopefully making these adjustments will solve your curling-finger problem by helping to relax your hand, but even they don't solve that particular problem they are worth checking out.