Goodyear Aquatreads were worn to the wear indicator bars. Shimmy would start at about 69mph & get worse the faster one went. Didn't check for when the speed at which it went away.
Checked tirerack.com for review results. Looks like General Altimax HP'* currently have the highest rating for the category I was looking for, so I had a pair installed on the front. Drove about 600 miles over the 3 day weekend. Shimmy is gone!
Now to get another pair for the rear.
While some tire companies may have made good tires in the past, as their equipment wears out the tire quality can deteriorate as well. It'* not so much about brands but more about which company has the newest tire making equipment.