There is still improvement to be had here. First try and get your setup and hold it, with no movement, before moving on to the back squeeze. You are blurring them together right now which is causing you to pull out of position on many occasions. Once you setup, pause, then nothing else moves except your back which needs to flatten. You should be able to get more back flattening (extension) than this even. Try doing some back extension drills belly on the floor and pulling your chest off the ground. That is what the movement should be like.