I make a chest up, yet my back always rounds. I have tight hamstrings and tight shoulders. I do not feel pressure in my low back, but in my left si joint(sometimes) and upper back sometimes the day AFTER lifts.
Ok, so recommendations.
1. Butt lower to start
2. Pull scraps back
3. Tighter abs. Use your air and diaphragm to set your core.
4. Neutralize the angle of your head (don’t look forward or straight down) Look at a target on the floor 10-15 feet in front of you.
5. SLOW DOWN YOUR SET UP. Got through the motions methodically. Your 50% should look like your 1RM.
1. Pull some on the bar before applying full power.
Your power should look like this:
(20%....bar slightly bending.....100% pull) this process takes only half a second but it’s important for setting your body position.
2. Legs and hips need to move at the same time. No stripper deadlifts!!! (Not legs then back)
2. Keep head neutral on the pull
3. Keeps scaps back
I’d highly suggest you get on YouTube and watch a bunch of videos from good powerlifters and coaches. It appears you are mostly lifting at home. If you want to do more of this seriously maybe look into a gym that does this regularly. Such as powerlifting or a good CrossFit gym.
Your upper back isn’t tight at all. You should be actively using your last to keep the bar close to you. When you’re setting up focus on keeping your scap retracted, nice and tight. When you’re initiating the pull imagine you have tennis balls between your armpits, and with your arms you’re trying to mash those tennis balls as you pull. That’ll help to activate your lats.
Video from the side would give a little better angle. So the whole rounded upper back is a tricky thing man. I pulled rounded upper back I always have. But it works for me, pulled 640 pretty easily before so whatever I guess. The one thing that is universal for all deadlift forms and body types is every single muscle in your body needs to be tight when your hands touch the bar. Video yourself from the side and be honest with yourself. I’d say lower the weight to a moderate weight and just drill your form. Strengthen your upper back, build your back up with some rows and rack pulls. Hey even some quality shrugs with go a long way.
So Update: I couldn't lift the bar up earlier, at least with a conventional stance. I could not get the weight off the floor, even when lowering the weight down from 405 to 345. I lowered the weight down to 305 and switched to a sumo, or at least a more sumo style stance. I notcied that pulling from the floor and leaning back was WAY easier and put more pressure into my quads. Here is the new video and even though it doesn't look like a text book sumo deadlift, I think I am making progress and may be better off switching to the sumo style, as it is much easier to pull back for me in this style. Anyway, here is the new video.