Can see videos now on my phone. Tbh form looks a whole lot better than was expecting. Back is close to neutral and maintained through the lift.
What nobody can see from the video might be more important. Whether your local and global stabilisers (I know it sounds like Broscience but it’s not) muscles, such as Transversus abdominis, Multifidus and the pelvic floor muscles, are coming on or not is very relevant due to your history of back issues.
Often in these populations the activation and timing of these are often messed up.
When they are working right they stabilise your spinal segments spreading/sharing load evenly across appropriate structures, away from/protecting other structures and allow your big torque generating global movers to do their work most efficiently.
See a physio/physical therapist for more.