Struggling with doorknob partial suspension. Every once in a while, I find my sweetspot, but then I can't replicate it.

[Bong-Hit-Transplant]

This weird thing happens where I begin to feel a very painful pressure in my head and jaw, and even if I would've passed out if I pushed through, it's too painful to continue. It's strange because I can still breathe fine, so the only other thing it could be blocking is blood circulation, but that would just cause me to pass out, so idk what could be happening I'm beginning to think it has less to do with where the rope is located and more with the angle. In the movies, the rope is almost pulling parallel with the spine, but maybe having it as perpendicular as possible is best? Or maybe I need to make sure the rope is fully tightened against the back of my neck so the pressure is more evenly distributed around the sides? Idk.

Anyone else have any tips for me? Specifically with the head pressure thing, but really anything at all with partial suspension. This is my first time killing myself if you can believe it so I'm a bit of a greenhorn I suppose.