Stand tall for the Jerks, your knees are slightly bent = wasted energy. When it's f0cking heavy it won't help you out.
Stand tall, weight really on your heels, lean backwards a touch, don't bend backwards but keep everything tight and straight and lean slightly backwards. The bar will be inline with your heels. Dip on your heels, drive on your heels then split. Go long with your front foot, short backfoot, bend it.
BUT THE MAIN THING IS TO GET YOUR HIPS UNDER THE BAR. Ideally you'd have a perfect split but that doesn't matter for sh!t if your hips ARE NOT UNDER THE BAR. Hips HAVE TO BE UNDER THE BAR TO be able to steady the jerk so your feet are together and you can get those white lights.