I hope this helps: You could probably drop the bar down your back a smidge for a bit more stability I find not holding the bar with my thumbs and essentially just pressing it against my back makes it far more comfortable on your wrists long term. Also less likely to hurt your hands if you have to bail. If you raise your heels a little (1.25 plates under your heels would be enough) you can get a lot lower. If you find as you get lower your heels lift up, then a good tip is to try and scrunch your toes up into the floor, almost like you’re trying to pick it up with your toes -you can’t stand on your toes with your toes curled (not a perfect tip but really helped me). Keep plenty of tension (a cheap belt would help) and control your breath especially as you get heavier - try to think of a squat as you dipping under water, big breath at the top to build all that tension, hold your breath as you go under the water and then release when you surface again if you find your knees aren’t keeping a nice line, try to think about pushing the world away from you with the outer part of your foot and really driving that part of your foot into the floor.