I was also interesting that RP said Hulk 'made some observations on the car when he drove at silverstone', and they have implemented them.
Additional to this both Andrew Green and Hulk himself said it was 'a very different car now'.
They obviously appreciated his feed back, so that alone has to be a bonus point for Hulk.
Lance is not that experienced with cars, but I would expect one of the full time drivers to have remarked on something that important. +1 for Hulk