Hi Louis -
I use counterweights to balance my wheels. For one wheel, I got some thick washers, maybe an inch outside diameter, and bent them at a slight angle in a vise with a hammer to match the contour of the rim. Then I got double-sided sticky foam tape and cleaned the wheel rim outside really good with a slovent like gasoline. When I suspend the wheel off the ground, I apply tape and washers over a six-inch length of so of the rim at the 12 o'clock position. With enough washers, eventually this area equals the weight of the opposite side. A light spin will show the tire is balanced. Then no more high-speed bouncing!
MikeJ