Camry :: 2011 SE - Vibration And Rough Ride

I have a 2011 Camry SE with about 25K miles on it. I was pretty happy with my car until I purchased 4 new Michelin Primacy MXV4 tires. Based on overwhelmingly positive reviews, I decided to purchase those Michelin tires. However, as soon as they were put on, the nightmares began.

First, steering wheel started to shake and car felt very wobbly at highway speeds. The ride also felt a lot bumpier and the front of the car (floor, center console, etc) vibrated a lot. I thought, okay, tires probably just needed to be rebalanced. So, I took the car to the shop and had them rebalance the tires. That didn't work, so I took it back again and had 2 other shops attempt to balance them. It got slightly better, but still did the same thing.

Thinking the tires were defective, I had the shop swap them out for 4 new Bridgestone tires. The shaking continued despite having the tires changed but the wobble went away. So, I had them rebalanced 2 more times with the last time being at a shop with the latest Hunter Road Force Touch machine. The mechanic told me he road force balanced it and the machine got it down to 0 with no indication of defective wheel or tires.

After the road force balance, it's gotten a lot better, but I still feel mild shaking/vibration on the steering wheel at speeds > 70 mph on most freeway surfaces (but not all). The floor vibration has also gotten a little better, but remained, and the ride is still bumpy.

I took my car to 2 different dealers and told them the situation. Both of them said nothing was wrong with the suspension or struts, nor were any mounts broken.