Camry :: 2010 LE - Vibration While Driving At A Lower Speed

I have a 2010 Camry LE, 2.5L auto, with approx 35k miles. While driving between 65-75 mph (I don't drive above that, so I can't tell you if it keeps going), I get a slight vibration in the seat, floorboard, and steering wheel. If no one is in the passenger front seat you can look over and see the headrest and seat vibrating like a massage chair.

I had the wheels checked and three were bent (I bought it used, so I don't know how the wheels got bent). I had new aftermarket wheels installed, same 16 inch size as the OEM. That didn't fix it. I had the wheels/tires hunter road force balanced, found out the two in the back were out of spec. So I had brand new Michelin MXV4's installed all around and hunter road force balance. That didn't fix it (though it is a lot better -- clearly the bad tires and bad wheels were causing part of the problem).

I had the car aligned to perfection. That didn't fix it.

I had a rear brake that was rubbing so I replaced the discs and pads in the back, but that didn't fix it.

I've checked all the wheel bearings for any signs of being loose, but they don't shake at all when the car is jacked up.

I've checked the struts, both by bumping the car at the corners and a visual inspection, but see nothing wrong with them.

I've checked the CV shafts -- the boots are fine, there's no play in them, nothing.

I've taken the dogbone mount off and checked it -- no cracks.

I've taken apart the front brakes to check them. No problems there (they even have new discs).

I've checked the ball joints -- no play. I've checked the steering linkage -- no play.

There's no pulsation in the brake pedal.

If the car is vibrating at a lower speed, it's not noticeable. But once you hit about 65-70, it becomes obvious to the driver. I've had passengers in the car who didn't notice, but they aren't holding onto the steering wheel and pushing the gas pedal. Both give a massaging-like pulsation.