Very good read man. All he says in there goes right along with what feels natural for me when lifting.
Welcome. It's a she btw, haha. A down to earth MIT PhD rocket scientist with great insight on the physics of lifting. I find myself agreeing with her a lot.
I should thank you too for the tip on using 5lb plates. Today I first tried using a block under my heels and that shit is impossibly tricky for some reason, I felt so awkward and unstable. It maybe because the weight was too heavy (120kg front squat) but then later I tried with 2.5kg plates and they're a lot easier to balance on compared to the block, albeit with a lighter weight. With the block i was unsure whether to put the weight on my heels in which case toes go up! Or on the toes in which case it just didn't feel right.
But even with the heel I can't get close to midfoot. I am quite lost for ideas now. It's frustrating me. I'm not even looking at the concentric, just the first half of the movement on the way down. Without midfoot alignment I'm a hopeless backsquatter. And an ugly front squatter. I might need a 2" heel to bring my hips closer under the bar as per Tommy Kono above.
So i think I have some thoughts on what to experiment with next time. I have to jettison the knee break first on HBBS. Sure it gives me a bounce at the bottom (hamstring?), it brings my knees forward and gives my legs some room to sit into. Those are the good things. The bad thigns are it takes me forward of midfoot. Causing a great deal of inclination of the chest, shooting hips back and making it a low quality unathletic exercise that puts too much stress on the low back. That's why it has to go.
INSTEAD I have to concentrate on holding bar position from the top and driving hips down hard in a straight vertical line. This will ensure at least in theory a midfoot bar path. Hopefully it will automatically put my legs etc in the position they need to be too. Now, what i've found in the past doing this is that it makes my shins vertical unless i knee break first. But i'll have to find a way to get that ankle angle smaller (maybe the heel will do that for me?). And this is about backsquat. On FS i have no fkn clue since I don't do the knee break thing at all. Perhaps just need a bigger heel i dont know.
Oh and ankle mobility is veryyyyy good right now. I went into FS warmups with great ankle flexiblity so i'm happy with the improvement i've made in that area.
a big total heel (> 1.75") is a bit crazy. and the scary thing is unless you groove the movement in a very upright manner, a bigger heel will actually force you even further of midfoot because any inclination that occurs naturally gets amplified with a heel UNLESS you consciously work on being more upright in which case it facilitates it. Kind of like alcohol and being horny in the porter scene of macbeth.