I really need help with my deadlift, guys. I. Just. Can't. Seem. To. Get. It.
Today I hurt my UPPER back doing them. HOW? I don't understand it. I took form videos at light weights (135 and 185) and it all LOOKS good, but the biggest problem I have is that I just don't feel powerful from the floor, and I don't know why. It's so frustrating. I absolutely do not feel any hamstring tension before the lift no matter what my setup is. I honestly cannot figure out what the fuck I'm doing wrong. I've followed Rippetoe's advice, Brolic's advice, JL's advice, I've watched tons of powerlifters deadlift, and I can't wrap my head around why this exercise is so mechanically difficult for me. Below is a video with various reps with different starting positions.
https://www.youtube.com/watch?v=1zuvoT6o-Ew&feature=youtu.be
You'll see my first pull I'm trying my best to "float the bar" as per JL Holdsworth's advice. But even though I'm doing it, I don't feel "strong." And I'm not quite sure how to actually "pull myself down using the bar."
The rest are more Rippetoe-inspired. Bar close to shin. Bend over and grab bar. Bend knees until shins touch bar. DON'T MOVE BAR. Squeeze chest way up and push heels down into ground. I slowed down the sets a bit to emphasize my form.
All of this sound goods, but I feel like I might actually be pushing my chest TOO far up because my upper back HURTS in a bad way.
Please, I beg you guys for help. What are the glaring flaws? How do I activate my hips and glutes more? I know there's something I'm not quite achieving because I'm thinking about so many damn things already (lat activation, heels into ground, chest up, chin tucked, hump the bar, etc.).
I just want to be able to smoothly transition into my setup and not think about all this other crap anymore!