The video that you mentioned is from May 29 when the Ferrari was launched, at that time you could make adjustments to the differential as you mentioned, one day later studio 397 updated the Ferrari and you can only work on the preload
Somehow i cant get a nice setup for the Aston Martin GTE regarding breaking. Or it will brake to early but it will lose speed. Or it feels like it wont brake at all and i end up in the gravel. It's like driving on ice missing the contact with the road. Lowering the car bij 1 cm gives a better feel/contact with the road, but its still very risky when entering a corner. Any tips?
Try closing brake cooling a bit and start braking earlier for the first lap. Also you can try tyre pressure to minimum.^^' Play with brake bias, maybe a bit more rear bias fits you better.