It is a little difficult to tell on the "miss" video, but it looks like you aren't keeping the weight close during the second pull. From the third video it also looks like you are starting your third pull too soon (you start the "shrug-under" before finishing hip extension). If your strength is greater than your lifts, these could possibly lead to your looping the bar over and behind.
For the first, keep your back tight. This does not mean just holding an arch, but flex your lats to actively keep the bar close to your body, and draw your shoulder blade together. Think of how you have to flex your lats during an RDL in order to keep the bar from swinging in front of you. You want to do the same thing the whole way through the lift.
For the second, focus on the hip finish, and only the hip finish. Don't worry on getting under the bar, just on extending your hips. Pulls can help your timing. High-hang work helps some people, but I've found it's more likely to teach beginners to cut their pull, your mileage may vary.