Interesting seeing how different body manufacturers spec their bodies for high/low grip conditions. Protoform spec their lowest downforce body (mazdaspeed 6) for high grip conditions, and spec their mazda 6 GX body (high downforce) for lower grip condition.
Bittydesign do the opposite. I suppose it might come down to driver preference. I found that I use agressive bodies when traction is low. It helps to get traction. As grip comes up, I notice many guys go to lower downforce bodies. I find the lower downforce bodies to work better in very high grip conditions too.
I must confess I've found the opposite as the extra front end that come with low grip and a high downforce body tends to make the rear loose, so the car is hard to drive.
SKiddins