I used the above setup for the Fiat & was able to Gold it with DS3 & using AT. Gold was achieved with 2.08 1st lap & 2.03 after that.
Had all aids off except ABS 1
Use controller sensitively 3 or less
Need to minimize tire squeal
Must take corner before long straight without lifting off gas
Don't overbrake at end of long straight (min speed in that corner was 62mph @ apex, 60 climbing up hill)
Keep your speed up as much as possible. I think there are only 4 turns where you need to use brakes (after 1st tunnel, at end of back straight, & at 2 sharp turns at end of lap).
You need to lift but not brake in first tunnel. Speed over split marker should be ~58.
I increased final gear up slightly for more acceleration but just under limiter. Will post final gear when I get on PS3.
Good luck!
EDIT: Final gear increased to 4.050
Thanks for the suggestions, I'll have a go later and let you know how I get on.
Bill