Have you tried op'ing in the evening, not too close to bedtime but say before dinner? I always tended to do more pulls if I was experience a detox reaction and figured the more poison coming out the more I would pull to get it out quickly. Sometimes I think it opens the flood gates and gets a good flow going, but then when you stop you are not evacuating the toxins as quickly as they are flowing out of you. I have done five or six pulls in a row before when I have gotten a major detox reaction, it helped.
I would also sometimes drink dailyt detox tea(tm) or use the detox footpads when I felt I was experiencing the exit of something too terrible to battle with just OP. I never got bad mouth pain so I certainly feel for you, it sounds terrible. But possibly increasing your op time to two or three times a day might help alleviate the pain somewhat. It definitely sounds like you are getting something bad out.