Interesting you have the same GPU as me!
Can I ask a question - is your GPU Usage actually increasing?
My problem at the moment is cudaminer is using my CPU instead of my GPU

Not sure for defo! When I tried CPU mining was getting approx 5k hashes per core, on cuda I'm getting 40 reported... Will try and check properly tonight... Doesn't help that I got a second card in there do gotta make sure I'm using the right device!