I agree with chris. You need to get a little lower
I would like to also add, your form will not break down until you get below parallel. Most people can keep their hips and thoracic spine tight when going to above parallel.
See what happens when you go down all the way.
lock each rep out at the top and dont be in such a rush for the next rep
I think you might have to "sit back" more as well but I'm not really sure. You're not getting to parallel so it's kinda hard to tell.