You need 33 inches just to touch the rim if your reach is 7'5 (2.26m) and the rim is 121 inches (3.08m) (at the highest part of the rim) so... not too shabby. You're about 4 inches over the rim so that's a ~37 inch jump.
Maybe it's time to man up and build up my low-bar squat, starting as low as it takes. My current block ends next week so it's a convenient point in time for a change.
This^^^^^
I still struggle with the low bar squat when I feel the bar slipping on my back like I did on Sunday. I used a "new" bar. Never doing that again. Old bars that have friction are the best for low bar squatting. And if I didn't have these unflexible shoulders/pecs/scapulas it would be so much easier.
If you can catch in a clean with your elbows up/in front you shouldn't have much problems low bar squatting AFTER you figure out where the bar should sit (which might take some time and make you think about quitting quite a few times before it happens).
But yeah, I started low bar squatting with 50 kg so...
What bar position do you use for the box squats vs the free squats?
When I was doing high bar full squats I had the same "problem"... I remember I was barely squatting 100x4 full but box squatting 110x5 (parallel box depth, but that wasn't the problem in the full squat).
When I was squatting high bar I was so quad dominant that when I was box squatting I could garner more glute power (even though I was still using a high bar placement) so... you might want to look into that.
You look at the ground when you bound and depth jump. If you make an effort to look forward and rebound as soon as you hit the ground you're going to do so much better at both these exercises.