that IS the Monza wing, they never intended to race it in Spa, just to evaluate it
Thank you. I was not aware that the extra-skinny rear wing was meant for Monza. The wing (left inset) without the vortex generators on the end-plates was evaluated by Sebastian on friday and was fast on the straight (as expected) but was down 0.8s to Webber's medium-downforce rear wing in S2 alone.
On saturday morning, the team converged on the medium-DF RW configuration, and the wet/changeable conditions of the qualifying session make the decision to use medium-DF wing inevitable.
Let's hope they try the wing again in Monza.