Saw the vid. That's horrible. Your back was in a very dangerous position, even allowing for a rounded upper back, which people with short arms need to get to the bar. The last rep I was sure you were going to blow a disc or take a dump, or both.
I'm not a trainer, even an unqualified inter webs one, but there are some serious issues with your lower back. It's nowhere near a neutral spine.
I hate to say this, but have you tried sumo? That will get your hips a little lower which MIGHT help with getting a neutral spine. That said, frankly you should be able to perform a neutral spine position without taking the bar off the floor.
Even the "good" form on the left is not right. The back is set right but his shoulders are way too far forward of the bar. This is pretty close:
Head is almost neutral too.
I would suggest just setting up a bar and plates and, without lifting it at all, take some vid of you getting into position. Play around with hip height and head position.