Issues with rallye wheels balancing?

If you are sure it is the rims, I would suspect a bent rim. There is a way to figure it out, or go through a process of elimination. First, I would mount the rim on a balancer and spin and observe if there is a visible wobble, you can also hold a tire crayon right up to the edge of the tread and right as the crayon touches, it will touch the "high spot" first. Also, you can move the tire where the vibration is suspected around to isolate it. For example if you suspect the left front has the vibration, move it to the left rear, and see if the vibration changes.