Lower the car. I'm not in front of the PS3 right now so I can't tell you my exact settings. But I lowered the car for my Bobs and they won pretty bit with just a little help in the beginning.
I think he means A-spec. You can easily win B-spec with default settings.
I think I had TC on 8, ABS on 4, SRF ON and ASM OFF. Active steering was on mild I think.
Try the tuning section may be?
https://www.gtplanet.net/forum/showthread.php?t=142091&page=4
Check this out, it worked great for me!
Try to overtake at the start, with an engine rebuild at 930 or so HP, it will be very easy.