Honestly, once the torso gets so vertical, is there any reason not just to do a sumo deadlift?
One of my favorite deadlifters I've seen, who I think is a lot more athletic and technically sound (better ROM and obvious lockout) is Konstantinovs.
He does use a round upper back, but thats mostly due to how friggin' tall he is -
4 Reps at 815. Love it-
2 x 885.