Shedman,
I replaced my Big O tires back in December with Bridgestone Dueler A/T. I noticed the Big O's were not the stock size Toyota called for with the 16" wheel, so I figured I'd go back to what the book called for and see if it helped. The vibration is pretty much completely gone. I still feel it sometimes around 35 when I first start driving, but it is gone at 65.
Some other info, I bought the tires at Costco, and I don't think they have the Haweka adapter. The tires still ride great and have no vibration issues. However, I did get mud on the right tire (only) the other day turning off a road. When I started to drive down the road the imbalence of the mud on the tire started an intense vibration, but once the mud was gone, so was the vibration.
For me, I'd have to say it was the tires, or at least, new tires got rid of the vibration being caused by some other worn part. I know how frustrating this can be....
Good luck and let me know if you have any other questions.
I won't be near a computer until Monday, so I'll respond then.

Vern.