I would think that if you have no noticeable wheel imbalance or wobble, then the loosening/tightening of the lugs was not the problem. Any damage to the wheel surface, the lug bolts, or the hub surface would manifest itself in a wheel wobble/imbalance. Have you spun the wheels to check runout? Do the hub bearings feel snug and turn freely? If those are good, then those elements could not be affecting the suspension performance as described.

DG