Just read through this thread for the first time. A few things:
1) I don't see where you mention whether the shaking is a new phenomenon or if the car has done this from day one of your ownership. If it's "always" been there, then the possibility exists that it's more than a tire/wheel/brake/suspension issue, in which case some careful measurements of the body and frame are probably in order.
2) Given the number of tire/wheel combos you say you've tried you can can set aside - if you haven't already - the idea that the tires and wheels are the culprit and focus on the suspension (depending on the answer to No.1 above, of course).
3) In an earlier post you noted that one front wheel rotates easily, while the other is harder to spin. Chances are, unless the one that's hanging up is more than just a little harder to turn, this is nothing more than a slight over-tightening of the spindle nut. I wouldn't expect this to cause any sort of shimmy, however, but rather to perhaps make the car pull slightly to one side.
3a) If on the other hand, the wheel you think is too tight is actually tightened properly (the front wheel shouldn't spin absolutely freely) then it's possible the one you think is fine is actually too loose, a condition that could certainly manifest itself by way of a shimmy, shudder or shake.
4) Front suspensions aren't terribly complicated, but they do require that the various components work together in some reasonable level of harmony. Shock absorbers, for example, were mentioned earlier. While shocks might not come first to mind as the likely cause of a front end shimmy they, like any front suspension part, should not be dismissed out-of-hand ... particularly after other, more commonly expected culprits, have been eliminated.
Finally, along with being not all that complicated (dirty, grimy, gorilla-type work, to be sure, but not complicated), the cost to rebuild a suspension is pretty tame when compared with some other major, or fairly major projects (I'm assuming here that you're a DIY kinda guy who won't be forking over $60-$80/hr for labor) so you might consider eliminating the problem by eliminating every worn out part (again, depending on your answer to No.1).
Last edited by nkowi; 02-09-2019 at 08:59 AM.