the splitter leading edge is coincident with the rearmost part of the front wheels.so the splitter=flat bottom is starting exactly 330mm behind the front axle.
Underneath the Flat bottom we got the plank wich is 10mm in height and has to be parallel front to rear-nowhere is written that the plank has to be flat!
If I remember correctly til 2010 there was a +/- 5mm in z tolerance in flatness of the flatbottom -to allow for manufacturing inconsitencies.This was reduced to 3mm for 2011.this rule effectively allows for a 10mm(now 6mm) hump ,bow ,kink in longitudinal direction in the flat bottom to which the plank is attached.
Using this tolerance cleverly there is a lot of scope to be able to run the front of the car lower to the ground ,as you can raise the teatray about 6mm and the leading edge will not be first to touch the ground.
the new rule saying the front portion of the plank has to be at least 1200(?)mm tells us were the kink in the bottom will be positioned in 2011..