It seems to be just a little worse - at the onset I've tried a lower gear but no change - it can get pretty severe and directly proportional to the torque applied when in the speed range (55 to 65 mph).
If I'm steady at around 60 mph and accelerate the shake will start - can actually see the hood shake left to right.
After noticing the wear on the inboard edge of the two front tires (see below linked thread) I'm suspecting its tie rods, so this weekend I'll get my wife to assist in jostling the steering wheel while I try to asses which tie rod it is (inner, outer, left, right)
I will change both sides but if it's the outer I'll do both outers, unless I find a rubber boot was the root cause I'll rethink the need to do both sides.
Now, I'm leaning towards going with Motorcraft unless someone can recommend anything better.
In about 15K miles I'll be installing new tires and need this resolved by then.