I think PD might have solved this if you're using racing tires. I can get into the "!" state on race softs front/intermediates back, but no matter what I tweak it always seems to come out around 1090pp if I'm moving variables down, 1120pp if moving them up. So there doesn't seem to be that wonky "break point" where it will show a much lower PP. I've obviously not tried everything yet, and the fact that it can still reach "!" means there may be a way. Heavy Wet may be the answer, and as long as we can get the car into Sardegna we should be able to pit and change tires (unless they've fixed that as well)
The suspension settings don't seem to matter; once it's in "!" you can move the toe, camber, springs to normal levels and still keep it in the "!" state. Although maybe that's why I can't get it to "break" is I'm trying to create a drivable suspension before even getting the PP low enough for entry... This could take a while.