Seated Good Mornings?

Just hit a new squat PR of 425 and everything was good excepts upper back came forward way too much. Trying to identify the weaknesses in my main lifts and attack them with accessories to build. I took Jim’s advice regarding removing the BBB accessories with Spinal Tap and am just doing lat and ab work. So what have y’all found to build this weakness in a squat up? Or is that a weakness elsewhere that is manifested there?

Thx

Probably a strength weakness. Get stronger.