First things first: stand up completely straight before you start each rep.
Looks like your knees should track more forward of your toes than they are. Hard to tell where your toes are because your shoes are black.
What do you mean when you say you're not keeping your shoulders up enough?
I didn't know any Texas method variant had an AMRAP component.
I'm obviously not an SSC. More qualified eyes may weigh in here, but maybe you should post your video on the SSC Q&A forum.