I tried the binaries posted by djm34 and it looks like I am getting a little better scrypt performance with the new version:
GTX 780Ti (~20-40 khash) improvement, it might be me but I think I'm seeing a little more CPU usage as well, but it's a little too early in the morning for me
However scrypt-jane appears to be broken:
I should try djm34 version because I don't get that sort of performance on scrypt with my gtx780ti

For scrypt-jane try to autotune first