It does sound like a ground issue. The radiator support and body sit on rubber or urethane mounts. Since you jump the ground to the control arm that appears to be the problem. I would leave the ground where the factory had it and add a ground wire from the radiator support to the chassis/frame. You should also make sure you have good grounds from the engine to chassis and body to chassis. They make ground wire kits specifically for this, or you can make your own wires. Make sure the mounting points are clean bare metal. Proper grounds will eliminate many electrical issues on these cars.
My buddy used a kit that wanted all of these grounds made. His car is EFI and a lot of extra electrical systems and he's never had an issue. Many consider it overkill, but I figure I'll give you the info anyway.
4 AWG Ground Cable – Battery Negative (-) to Frame, 2.5 ft.
4 AWG Ground Cable – Bell Housing to Frame, 1.5 ft.
8 AWG Ground Cable Assortment:
Battery Negative (-) to Body
Frame to Core Support
Rear End Housing to Frame
Bell Housing to Firewall
Cylinder Head to Cylinder Head
Cylinder Head to Frame
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