Ill say the same thing. Your posterior chain has not caught up with your leg strength. Form was better the last time. SLRDL are amazing for that. 3x8-12 will do wonders for the long run.
The only thing I can mention at this point, is your leg width. I found that playing with that help with my squat a lot. I used to have a "bodybuilding" stance (narrow with 2x4 under heals, toes in). I moved to a wider stance (not as wide as powerlifter, toes out) and it is way more comfortable for me.
The basic that Ripp describes in his video are standard for everyone. Head position, flat back, etc. The small stuff will change depending on your height, weight, femur length, hip health, knee health, etc.