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Bernie - if your "float" symptoms are coming in at those kind of speeds, then I would suspect aerodynamic front end lift. Try setting the car up so it is higher at the rear tha the front, often helps, and is recommended by many as the "proper" way to set ride height.
Could you get someone to run alongside you at those speeds (safely) and feed back to you about the front end height at speed?
HTH
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Wilf
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