This is a very tough race, in that the AI are near full mods. While the HP may be a benefit, in the FF cars, you need to be very smooth when applying power on corner exit.
If you really punch the power exiting a corner, you'll understeer into the outside wall. This means you lose considerable ground to the AI when running down the following stretch.
Try adjusting your braking points to earlier than you think. Then steering into the corners while coasting. This will keep the car stable and all four wheels working towads traction. When you are about 1/3 of the way through the corner, apply 1/2 throttle. At the 3/4 way through the corner go to full throttle.
This race series is all about corner control. The AI are seriously loaded up and are right on in the races. Any wall banging on your part gives them a decided advantage.
You'll be amazed at how much time you make up in clean corners.
Also if you have them handy, post up your settings and we can offer you a few improvements.
As a helpful note, do a search through this forum for "Pro Vitz series" and you should find two or three really descriptive write-ups from people who won this series.
And as a final note, Welcome aboard GTplanet.
AO