This car ROCKS hard. Astonishing work. I love it. I saw that Postpate added the H shifter option (that is simply GREAT) but, in my opinion, there is still a big problem. I propose to make an easy test for to see that.
For do that test I invite you to see what happens at the rear axle. See the image for make this test easier to understand.
In my opinion the car has some problem on the rear suspensions. Bump and rebounds are the issue for me. If you try to accellerate you will be able to see that the car is not really able to sustain the power of the compression in the suspensions...simply there is no space and time for them to sustain. So there will be a bouncing of the rear axle and the car will be uncontrollable with a spin in a mere and stupid accelleration on straight. It is the same issue that have the Merc AMG of the GT3's DLC in some way (on default setup I mean). But that is very easy to see in that case.
Try to make a standing start (until 4° gear) with default suspension option (4/4) and see what happens (in slow motion on replay) with the same camera in the thumbnail. Than do the same thing with minimum values (1/1 so the softer suspensions) and for the 3° try use something like 9/7...or 10/8.
You will see that the worst situation is to have softer bump and rebounds. Also with 4/4 is too hard to control the car. There is no space for make the suspensions work. Even with low accelerations and brake sessions is too easy to have mechanical limit. To have values like 9/7 or 10/8 will be good but only on flat circuits like Monza. It is not enough for circuits like Monza 10Km, Nordschleife, Spa, Monaco etc etc.
The other things on setup doesn't affect that effect on straight, clean and no-bumpy tracks, so the only way for avoid the problem is to work on suspensions values making them stiffer.
I think that is needed a tiny recalibration on that. Another way to solve that it could be to have more values for bumps and rebounds (up to now the stiffer value for them is 11...I think it would be necessary 30 for driving in the Nords).