I think this setup makes the car easier to drive, more stiff, but slower. This car demand to much of the driver, very unforgiven, any micro mistake and you take some punishment on your lap time. I made a lap 1 second faster just put 2 more psi on front tyres, 1 more on rear tyres, 1 click more for final ratio gears and put 3 less downforce on rear wings, very useful to gain speed on the straights and still enough to do Eau Rouge and Blanchimont full flat. All this changes on default setup.