There have been Various videos and reviews on how the bikes handle, and while I do not have any firsthand experience in riding them, there is a general consistent opinion of what should and shouldn't happen.
As for correct values, putting in the correct physics values when compared to the real world actually very rarely gives a 100%, or even a 50% accurate simulation, and most machines, even the large team owned F1 simulator's, are a best guess scenario. If you really wanted the values to be 100% accurate in terms of use, then you'd have to start programming air density and gravity at that specific track, elevation, etc.
The feeling from the front is the larger issue for me, as I can solve the downshift issues with earlier braking and practice. it seems inconsistent, one line one lap is fine, next lap is a crash on same line same inputs etc. Maybe if the negative camber issues are fixed then that may help with the overall feel of it.