[modern] XJ8 steering rack wobble HELP!

Hi list, I solved my cars front en vibes. The guy that balanced the front
wheels attached the weight to loosely and they fell of thus…

However, when I take a slow turn 20mph or less I feel the steering wheel
give me a light shack - wobble as the steering wheel returns to 12 o Clock
position. Its as if the rack were hesitating rather than turning smoothly?
This is really strange because my rack is brand spanking new.
My front wheel bearings are also new and very solidly in place. No strange
noises on the rack or pump.

Thank you for any and all help. Enrique

XJ8 Sovereign