It appears like your fingers are "caving in". Which may mean they could benefit with being stronger, or possibly as mentioned you might be putting too much force. If it was me I would go back to basics. Starting off with finger strengthening for example this exercise is pretty good:
http://www.youtube.com/watch?v=S-tQP4Bweq0 . Along with that I would do hammer-ons and pull-offs for each individual finger. Once I was comfortable with that I'd do finger permutations & spider walk exercises. That will develop full independence of each finger. The key to any of the above though is forget about speed. Aim for strength and accuracy of your fingers. Once accuracy is down then speed will come over time. You may have to go at what seems a dead slow pace. If practiced daily you should notice improvement in a week or two, possibly less. That's just my general take at least.