So it's without question the GTEye is a fantastic product. I've been racing on mostly Monaco 67, but I went onto Spa 67 and it makes my ability to just attack put a smile on my face. That first turn out of the starting straight was always a bit of an adventure for me. So smooth now.
Also found another interesting tuning site:
http://www.racelinecentral.com/RacingSetupGuide.html#How to Use this Guide
Seems like it was written as a manual for Nascar, but it really does a good job of explaining what each thing is doing on a technical level. And how you should test to find optimal settings for each course.
Between slowly working the kinks out of the setups so I can really attack, and the new brake, the 67 F2 car in rf2 is becoming my favorite car of all-time.