Embedded-cool.
You'll get more knowledgeable responses than mine (hopefully) but two things I see are that you go very deep, which would be fine but you're getting "butt wink." May not be a problem, but you don't need to drop so low.
You're very vertical, is the bar slightly higher than it should be?
Also, your valsalva looks like you're holding it in your mouth--try and hold it in the glottis, your throat.