Heres the update:
The car has been aligned, rebalanced and rotated and the vibration and humming still persist. Also, a less than reputable shop put in two new front shocks a few months ago and Ive noticed the front sits about an inch or so higher than the rear, the mechanic referenced a ride height sensor being messed up. Any input? Anyone know of a good indy around the woodlands/spring/conroe/houston?