Sorry about that, the rear lower shock mount position is the inner hole on the arm, whenever we raise the rear hub we use the "c" shock tower, if you don't the droop and the up travel aren't right. The "c" shock tower was made specifically for using the hub in the up position (lower hole). I will get the setup sheet updated with this info.
As far as the Avid chassis goes it keeps the chassis from rolling (keeps the chassis flatter), I know people have talked on here about the extra weight but we have tested by adding weight to the stock carbon chassis and it's definitely not the weight it is the stiffness. For me it makes the car more stable and generates less grip, I would use it on high grip tracks only.
I've never used the Schelle chassis.