I decided to try this car several minutes ago, after I finished updating my 962C liveries... so there is certainly ways to go in both driving and tuning! But I got into the mid 17's with this, I think the Gold was just a better drive away.
Thanks to this setup I managed to do 1:17.990, unlocking the gold achievement. I am sure I can get another second down by being a little bit cleaner, but hey I got what I needed