You’re effectively good morning-ing every rep. From what I can see in each video it’s only a matter of time before you hurt your back. In terms of weight on the bar you’re leaving a huge amount on the table because your technique is so inefficient.
This is what I would suggest
- move the bar up. It’s probably way, way lower than you need it to be. Doesn’t have to be high bar as such, but certainly higher than it is now
- stop tilting your pelvis forward before you start your descent. Instead, squeeze your glutes after unracking and keep them squeezed as you descend. This will keep your pelvis from tilting forward, which will take a lot of strain off your back.
- squeeze your abs hard without losing the squeeze in your glutes
- sit straight down instead of back and push your knees out while driving your head straight back into the bar
- as soon as you hit depth come back up by pushing your knees hard out, drive your traps up and squeezing your abs