I looked for them in a search and couldn't find them and I think they were races or something like that. Anyway, those threads are several pages back and seem to have run their course so that's why I started a new one.
I do think the video idea is a good one. I'll start.
start at 35s
That's my 515. I know it's awful. It looks more like a rounded back stiff legged deadlift than a real one and I'm working hard on fixing that and have been making progress.
Here's 495 10 weeks later:
Still not great, but much better and 96% of the old max so I now I'm going in the right direction.
At sub 85% I can maintain my form and have done video checks on this site to insure that. So that leads me to believe the issue is muscular.
I really worked on the start portion of the deadlift by focusing on form with lighter weights and building the pull with narrow stance squats, front squats, and the occasional goodmorning to maintain the back strength I already have.
I'm trying to build my hips and low back up now in addition to my quads because I think my back is getting rounded from my body trying to shorten my back because my hips and low back can't handle the lever so it becomes a leg and thoracic extension instead of a leg and hip extension movement.