SD, before you take a pull, inhale as much air into your belly and just hold it and try to flex abs, it makes a difference.
I always keep my head neutral, some say look up but mine is better neutral.
I don't drop my hips so much that my quads get too much activation (think squat).
Just drop the weight, I'll try to do a couple videos of what I do to see if it helps. I'll have to record it in gym and voice overlay it but I'll try it out and see if I can help. I'm not flexible so this is going to have somewhat of the same problems you may have.
Def. keep the upper back rounded, there's a technique to that, I use personally. I usually am starting to "pull" in a sense when I go to drop hips down a little bit, basically like a stretch reflex. Keep in touch I'll try to post some helpful vids.