Sounds counter intuitive but,
---slower really is faster---
Take your time learning the course, focus on smooth transitions - abrupt actions usually only serve to disrupt the "set" the chassis has taken and make your next input that much more difficult. In stock form the GT has plenty of muscle to encourage you to forget about carrying momentum and maintaining rhythm on the road course but mashing the brakes and throttle is not the best (or most fun imo) way to turn laps! Remember - it's about quality, not quantity. :thumbsup
One technique I use on a new track is to limit myself initially to 1/2 throttle till I'm sure of the course lay out & details. In addition to simply learning the turns you'll find many different surfaces on the same road course, there could be 10 different variations of asphalt and concrete. Learn where they are and how they effect the car. You don't need to short shift, just pretend that partial throttle is all that's available, then as you get more comfortable, start squeezing on more and more of the skinny peddle until you reach YOUR maximum comfort level.
Thanks for the great post Chip! I can't wait to see all these beautiful cars together again! :cheers