You think high? That height was marked for me by a few of the guys there who actually compete. He actually owns the gym and has been competed for over 40 years so I just kinda took his word. It's actually a cushion I'm going down to so there's a good 2 inches of give you probably don't see??
The weird thing is, the safety squat numbers are essentially the same as my straight bar ones.
I typically maintain tightness in my lower back, I was just trying to actually sit back onto the box this time. One of the trainers told me I wasn't doing box squats, but rather just squatting to a box if that makes sense. So it's definitely a work in progress right now to figure out how to maintain a rigid lumbar curve, while literally sitting back on the box and driving back up with the hips.
I could definitely work on upper back tightness. While it may have something to do with the safety bar, one of the coaches actually told me I have a little big of collapsing going on up there even on my deadlifts.