Well I thought I had a decent tune before I did that race. Drove the car on several tracks and it was handling ok. When I finally attempted that race it handled like crap. Was really strange, so I had to retune it but it wasn't going well at all.
I lowered the race time to 1hr, still was unhappy with the drive, then down to 30 mins as I thought I could handle it for that long but in the end retuned it again and it actually became driveable.
One thing I will say is that I skipped the practise sessions and quali because it took too long to warm the tyres, could barely complete a decent lap on cold ones. I went straight to the race, drove for a bit, quit and retuned until I was happy. Raced at 70%, won from the back of the grid. I'll try to send you a shot of my tune when I can.
Apart from the handling I gained several seconds by effectively getting rid of first gear as I lowered all gear sliders by one notch, allowing higher revs throughout the gears and could get more speed. Works really well for this car.