Ben, I think your first video was better than your recent ones. After watching the video you just posted, I wondered why I hadn't commented. But looking back on the first video, I saw some better positions, and figured you were on the right track. But now, not so much.
I would focus on two things: 1. Get your shoulders over the bar and 2. hip extension. In your start, in your pulls, in all of them except on that first video, your shoulders are behind the bar when you start your explosion. Keep your hips higher and shoulders over the bar longer. When you see good lifters lift, they do this. When you see good lifters screw up their big lifts, they do what you're doing now.
Hip extension is the key to making a lift. Lost in the discussion of jumping or not, etc. is this: Jumping gets the athlete to focus on explosive and powerful extension of the body. You need a violent and explosive extension to lift well. That violent and explosive extension does not come from the feet, it comes from the hips and the knees, moving together, and flattening the plane of the body out. If you want to think "jump", go ahead. But instead of lifting your feet off the ground as you would in a vertical leap, keep them flat. Right when you're at the point of the jump where you're going to leave the ground, DRIVE your feet flat into the ground. This movement will start teaching you the violent and explosive hip extension you need.
Do it slowly 2-3 times with the empty bar or a broomstick/ pvc. Then do it faster. Olympic Lifting isn't slow. Don't train your movements slowly.
I may have missed something here on the forum, but if you're in St. Louis, why can't you go to the Kirkwood Weightlifting Club for some instruction?