Almost all vibrations are to be found in the wheels or tires. How were the tires mounted and balanced? Road Force balanced using a Hunter 97XX machine? Where were the tires purchased, locally or online? What did the Hunter machine print out about the tires being out-of-round (they ALL are to some degree, but must be within a certain tolerance in order to be balanced properly).
There could be other causes of what you're experiencing, but I'd be surprised in the answer doesn't lie in the tires/wheels.
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