so just to update about my steering shake on pg2-3..
got a good proper alignment from a ex-bmw tech, shims were involved.
got my guibdo replaced, was all dry & cracked - that helped abit..
But what completely removed the violent shaking at speeds, are you ready;
brake rotors... the uuc slotted i had looked ok & had low milage from being in out of various shops, sitting for months, etc.. but there was some warpage..