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First thing I notice… your hips shoot up before the bar starts moving. Making you “good Morning”. This is not optimal if you enjoy having a healthy lower back. You really need to hit your posterior chain more espeacially in strengthening that specific weakness. So I suggest Good Mornings. Maybe swap out a few of your Stiff Leg Deads for a Squat Stance Good Morning and Glute Hams. I also took a quick look and you don’t seem to focus on much Core work I would put some heavy Ab Work and Stability for your core work in.
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The very next thing that happens as soon as your hips shoot up your knees cave in. Both putting extra stress where it def does not to be. Not a very strong Squat position and can quickly lead to a MCL tear if not careful. You need to seriously focus on forcing your knees out as hard as possible through out the entire lift. If this is a weakness then train it quickly. Obviously its max effort and your form is obviously gonna break down. Which is what you want so you can see what your weakness is and address it. Then when you max again you most likely find either that weakness has been strengthen and your performance performed but now you have different weakness that needs to be addressed in which case you change your training movements up and improve again. This is essentially the principle behind West Side… Find your weakness crush it till its stronger and your stronger for it.
Check out the Video I just posted and watch the knees stay flared the entire time and chest stays high. Once I begin coming out of the hole the bar is immediately rising with my hips not hips then bar. I am by no means a amazing squatter but, my form is pretty spot on for me atleast. Considering you are squatting without heels and squatting just out side shoulder width your squat and my squat should some what mimic each other.
But great lift man and congrats on the PR keep it going and you will be beast by your 20’s without a doubt in my mind.