I tried something last week where I did a 3-second negative, then came up a 1/4 rep and held that for two seconds, then went back down and finished the rep. Awful!
I also tried a “Bulgarian deadlift” if there’s such a thing. I set my legs up like a BSS with one on the bench behind me, but I had the bar in front and deadlifted it. It forced me to extend my knee a little more at the top. I don’t know if I loved it, but it was different.