It's hard to "diagnose" over the Internet, but I'll take a stab.
When does the front feel light under acceleration? At lower speeds, or high speed?
The loss of front end feel sounds normal to me. There will be some aerodynamic lift, and every steering input is magnified because of the greater distance travel per second. You will still feel the loss of traction in the normal manner, the steering will get light, and the car will be unable to turn at the desired radius, with additional steering input having no effect. (assuming an understeering car, a car with high-speed oversteer is much more exciting! ) I think the main problem is that you can't get away with grossly overstepping the limits like you can in lower speed corners and still "save it".
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