Ok
Lower the bar in a controlled manner. Also, you are breaking your knees *way* too early on the descent. Get the bar at your knees, then start bending them. See how the bar goes out and around your knees? I wonder if having the load pull away from you like that is contributing to your pain.
Have you tried DL without a belt? I'm wondering if your gut is causing issues with you getting into an effective position (see Rip's article about DLing belts).
You are absolutely right deadlifting without a belt if 100% more comfortable due to my gut, which I'm working on reducing. Without a belt I feel like when I squeeze my chest up I can feel my lower back going into locked extension in more powerful position.
Lowering the bar has also been an issue I can easily break hips first but with belt on feels awkward.
I don't want to progress with heavy weights without belt too, it's a 4inch belt and I'm only 5'6-7 at best so that maybe a contributing factor.
It was a warm up, I'm trying to attain a weight to reset back to. For the workset, going to reset and start with that(225) plus another 45lb I think. Progress from there the reason for the reset is I always got into a good starting position, but j don't remember fighting to stay in the position(e.g squezing chest up through out range of movement) during the actual pull.