I'm pretty sure blizz did away with all of the +hit talents, and locks don't get hit from spirit.
not sure what it would be, but I did check you out on askmrrobot.com and it says you need a bit more hit.
check out this link. its great for optimizing your gear:
http://www.askmrrobot.com/wow/gear/usa/ ... phan#v1-z1