I think the angle where I usually capture my form like the first video somtimes exaggerate things since I've some footage of me doing my heavier pulls ( which I just looked at ) at the same angle as the second video I posted and it looks better there but still not top notch.
My leg stength might be an issue as you prescribe since my squat and deadlift is around 110-125 lbs apart. But the gap is getting closer tho since I started doing front squats 7 months ago.
I did the lat cue from Candito but you don't see it well. I acutally did try to bend my elbows every rep.
I also tried to take the slack out of the bar but I think I failed a little bit there haha. I moved the bar a couple times with my chins and still need to learn how to do this properly.
My heavy deadlift session is this Saturday. So the bigger problems will probably occur then again.