Ok, so I was having really bad vibrations 55mph+. Teeth chattering, feel it in the wheel and through the pedals bad.
Had the tires balanced and rotated. It 90% better, but it's still there.
I did notice the steering damper is leaking. Could this be the culprit? If so, I can probably do this myself...or could it be something else?
The vibration doesn't come through the steering wheel anymore, but it's there...just a ghost of its former self.
Note: I probably waited way too long to get the tires rotated and balanced, but the first guy I hired to do the job stripped a lugnut on two different wheels, and told me there was nothing he could do. I had to wait for an appointment at the local body shop to get the lugnuts off...heat, chisels, and eventually new wheel studs were needed.