For your deadlift: it looks as though you’re taking far too much time with your set-up and as a result losing a lot of your tightness. I also can’t tall from this camera angle, but it looks as though your stance is a bit too wide, which might be causing some problems. Try bringing your feet closer together – you and I have similar builds and I deadlift with my feet significantly narrower than shoulder width apart.
Your shoulders also appear to be aligned well in front of the bar. The most obvious thing is, however, your spinal rounding. Really try to take a deep belly breath and to brace your abdomen before pulling the slack out of the bar and then driving through the floor. Don’t allow your back to immediately take the whole load: drive with the legs! You have a decent squat and therefore have the quad/ham strength to do much better on your deadlift – just be sure to drive hard with the legs to initiate the movement.
Check out this video for set-up cues: https://www.youtube.com/watch?v=bt4m4zLioRw