I am constantly getting the armbar from the guard, but not finishing it. I think I may not be setting it up correctly, but usually my opponents defend by stacking me. As I get the armbar on them and begin to crank, they usually drive there weight down into my legs, and I can't create enough space to finish. I am usually forced to recover guard because of this. I think I may be trying to power them off to much with my legs, trying to press them off of me to create the space. Maybe I should be shifting my position or hips, I'm not sure.