I try to stay away if possible from using "pain compliance" techniques. My reasoning behind this is that they don't work too well on drunk / high / highly motivated attackers.
Techniques such as the OSS "Chin Jab" accelerate the skull faster than the brain can catch up and produce a good concussion effect that works well both on regular and drug indused / motivated folks.
My goal is to induce something like this:
http://www.neuroskills.com/tbi/swfcoup.shtml
Of course everyone has a plan until the they get hit.