Some threads have been reporting that GT5 tunes are good starting points for GT6 cars. I know a few tuners did a tune for the Aventador in GT5. It might be worth your while trying to apply one of those to start with and play around with the settings to suit your driving style.
It was released as DLC in GT5 I think.Thanks I will do that. For some reason the I thought the Aventador wasn't in GT5.