This is a little light I’m about two plates now, maybe 15lbs higher on each side.
I am trying to not get wrist flexion as I get heavier and heavier. I watch Baraki’s lift a lot and his wrists do bend a little but they are much more neutral after one rep. My left wrist especially I don’t keep as tight - and it hurts.
Sizing on my squat shoes was also always been an issue (try to find a wide in squatting shoes let alone a place to try it at) tighting the straps more on my toe end on my left foot also helps keep my feet in place. I used to feel a little unbalanced/slide deeper into my toeboxo on my left shoe around BW.
First three reps I did as I normally do
Last two I did with some lumbar flexion. It’s something I see some guys do and I noticed or misconstrued Rip taking about it here? https://youtu.be/aXfOdvd-sJ0?t=571
Try some different grips, thumbs around, wider, narrower, with wrist straps, higher up on the bar and see if any of them feel more stable, reduce your pain. Some people squat with wrist flexion without pain so it’s really just finding a grip that is pain free for you.
Try to setup once you step out the rack and then keep that setup. Try to make this a routine so that your stance is consistent.
Pretty sure you’re a little way from parallel, if you’re ever going to compete this could be a problem. If you want to work on that, ideas would include seeing if you can make depth with just the bar and squatting to a box a few times to feel what proper depth feels like.
For the lumbar flexion you could try queuing yourself to start the ascent with your chest as opposed to hips. This is obviously sacrilege but give it a try and see if it helps.
Don’t try address these all at once but see if you can incorporate some of them over time. You’re not doing anything that’s going to cause an injury so don’t worry about that!