Try the lower position, it made my car feel much better for me. The car has ALOT more roll, more grip and was more stable. But you may have to make the car alot softer to make the car bite in, otherwise the car will just want to keep rolling through the corner. I dont think ill ever go back to the heigher position. My lap times went down arounf .3-.5 of a sec per lap
This was in mod and 10.5, on a low-med traction asphalt track.