Geronomo,
iirc, the last vid you posted one of your big issues was that your ankles were rolling in on your squats... can't really see from that vid if your knees/ankles are stable.
Bar is still too high.
You are losing lumbar extension at the bottom. Can you see this when you watch your vids? See as you drop below 90 degrees your lower back starts to round? Get keep it flat (or slightly arched). Get it in that position when you unrack. Tighten your upper back, abs, lower back. Squeeze everything and keep it that way throughout the lift.
I can see you are trying to get your hip drive on, but to get any real benefit from hip drive, you have to get the bar in the right position. i.e. lower. and once you do get the bar lower, you will have to concentrate more on beginning the movement by pushing your hips back. i.e. sit back first, then bend at the knees.
Can't *see* much wrong with your dead at that angle, but I've got a feeling you have the same issue with a rounded lower back at the start of the pull. Remember that the bottom position of your squat and dead will probably be fairly similar.
Also, this pic might help explain the impact the bar position has on your squat. Notice how the high bar position (what you are doing) tends to make the torso much more vertical? Well, when you don't really get any benefit from hip drive in this position. It will tend to just bring your shoulders forward (like what happens in the last couple of reps of your posted set).