Nate,
You could possibly have tight adductors or quadratus lorborum (QL). Is your glute medius engage in single leg movements? Without seeing you, we have to assume that the hamstring muscle group may have some tightness including your lats (especially on squats).
As far as the "tail tuck". It may not always be a flexibilty factor. It could be a femur to tibia length ratio, and if that is the case, we can stretch till the cows come home and it won't do a thing.
I know I am all over the place with my answer, so I am going to see what others chime to egt my wheels turning more.
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