Next time I'm on gt5 I'll submit my 11.644 second dc2 '99 tune
A good tip for ff is short gears and finding the right ballast weight. I normally set a suspension and a transmission then will just adjust ballast to improve. Very rarely have I needed to modify transmission.
Once that is done find whether the car works better on a quick shift or lengthy 1st gear. Because in FF the launch and 0-100mph are the biggest most important factors. 👍