Not exactly related to the setup itself, but if I may...
The real CCX is extremely "savage" - a lot of care is required when stepping on it. Mainly because it lacks enough negative lift on the back (the overhangs are very short and aerodynamics needed some additions) - the rear end snaps all too easily when taken to the limit, as the Stig proved at TG's track. If one uses proper tires and aerodynamics in GTRE, this "savagery" is much too evident.
The GT version, CCGT, has a properly developed race-pack aerodynamics (GT1-spec rear wing and diffuser), it was therefore quite easy to maintain car balance with it (according to Bard Eker, one of the test drivers).
SIMBIN, though, did not quite properly develop the tires for this car - or any of the others (a recurrent problem with SIMBIN and even ISI, even though a notable improvement happened from GTR2 to Race07->GTRE), and as a result forces developed are insufficient even with a front splitter of 2 and a rear wing set at 12º (you're using 1 and 8º). The car needs to achieve very high speeds for its downforce to be effective. And this because the relationship slip angle vs lateral force and slip ratio versus longitudinal force is wrong (not enough at lower loads, excessive at higher loads).
That said, in spite of that, GTRE's CCGT drives well and does not require knife-sharp reflexes as GTR2's MC12 or iRacing's C6r (2012) - even at the Nordschleiffe.
I can imagine, though, that trying to control such a powerful car with a gamepad must be quite a challenge.
Good to see you're enjoying yourself, m8.