Originally Posted by Airscape
Now it seems that they would just reduce lift and actually cause more downforce, reducing top speed/increasing handling at high speed.
The reason you are confused is because you are assuming an erroneous relationship between drag and downforce.
Drag and downforce are not always directly related. Therefore, it is possible to reduce lift, cause more downforce and still not reduce top speed.
For cars, ground effects make this possible/easy. In airplanes, you have to play different games (vortex generators, wing aspect, canards, wingtips, etc)
I had the stock CF at 115 on the track and repeatedly went around turns at 100+ mph. "Floaty" isn't the word I would use, although I'm sure everyone's interpretation of the word differs. I felt that the car behaved at those speeds the same as it does at 60mph. The only difference was the "fear factor" that comes when ones mind thinks, "what if I run off the road at these speeds?"