You don't lock out 3, 4 or 5, the others are questionable. Your first rep also looks like you started the pull with your back rather than your legs. If you did that makes it more difficult.
Why are you trying to set the bar down as quietly as you can? You are burning a lot of energy trying to set the bar down softly. You're on a platform with bumpers. Don't completely drop it, but you don't have to use a full eccentric motion to set it down either.