I totally understand where you're coming from. The pain while DTD is a huge issue for me. I feel awful for saying this but I absolutely hate DTD because it's so bad. I have never really found a way to help with this. Sometimes I'll take a painkiller beforehand to take the edge off, and morning is better because your muscles are relaxed and it's less painful.
Have you tried something like pre-seed to help with lubrication? I know it's supposed to be as close to CM as possible (unlike normal lubricants which I can't use because I'm allergic) and that might help a little.
Also, sometimes we have to keep trying different positions until we find the least painful one x x