I just read this entire thread. 80 fucking posts, and only 3 posts (this and the couple from Mark that followed) that address the real issue.
You’re built like a goddamn toothpick. That’s the issue. There are a fair amount of skinny, lanky guys out there with big pulls, but nobody is squatting big weights with skinny legs and such a thin torso. You need more upper back mass to support the weight, you need to brace better, and you flat out need bigger legs. I definitely think a ‘mass phase’, however you want to approach it, is necessary if you want to be a well rounded powerlifter. If all you really care about is hitting that world record deadlift you’ve talked about, then that may be an issue, because that will run counter to filling your body out for the other 2 lifts. Unless you’re committed to just weighing a whole lot more (which in my opinion, if you want to be good at powerlifting, you should do.)
Weight classes are height classes in disguise. If you’re taller than 6’0 (it looks like you are), then you should be competing at 200 lbs bodyweight at a bare minimum if you want a competitive total, and not just a pretty good deadlift.