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I see that the Armor stands update to the relative player height based on crouching and the aforementioned player states, but the model itself does not rotate when in the three flat states, and the model lines up closer to the players legs given that the player model is now rotated forward.

I assume a general rotation equation could be applied to the head of the Armorstand depending on the players state to better align the back items when the player is flat. This probably gets tricky while gliding, but a generic fix for the flat player states would be a big improvement by itself.