Squat form check, low back tightness

[Jacobrey5]

In short - looking for help with squat form check

Being doing NLP for ~ 3 months
Starting numbers -height 5”10” body weight ~175, squat - 255, bench 190, press 125, DL 315
Currently - weight 203, squat 315, bench 230, press 155, DL 375

I have recently done a reset on the squat down to 285 due to several failed sets combined with a vacation, but I also started getting insanely tight in my low back muscles anytime squatting above 290 -

Do I have a form problem or am I just too weak in my hams/glutes/low back to keep my back set? If too weak, can I fix by continuing to get my deadlift up and slow down adding weight to squat? Do back extensions need to take priority?

https://m.youtube.com/watch?v=0GRqymbo3IU

Thanks,
Jake

[Mark Rippetoe]

“Butt Wink” | Mark Rippetoe