It seems like your shake or shimmy is coming from the front end of your car. I would start looking really close at all rotating components in the front end.
It seems like you have already touched all of the suspension in the front end, which narrows it down to rotating running gear. Do you know when the last time the front wheel bearings were replaced? front brake rotors?
Beyond that I am running out of tire speed rotating devices to suggest checking to try and find this wiggle.
It is interesting that the 16" wheels fix the problem I think that you might be right with it masks the wiggle with its shear size and weight. with that being the case it looks like it is either your 15" wheels or something chassis related.
Keep us posted on any new findings.
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'81 300D - swapped to a 617.951 turbo motor with a 150 amp alt.
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