Thanks, dudes.
FS, this was the second set, was a bit fatigued at this point. The ridiculous welt on my back leads me to believe I was pulling down pretty hard. But I will take that point and be more aware of it. After the second rep I bumped something with my ass and you can see me look down at it and it was a bit distracting and the third rep was a bit off as a result. Still happy with the session.