first of all now ; big hand , congratulation , auguri & grazie to Sergio, Piero and Marco !!!!
as to tricky hint to solve or minimize Gts brake issue via setup:
Sergio you ment rear toe in negative ?
my brake ratio was 48% for Laguna Seca anyway.
and anyway I didnt get how to solve a random appearing issue via setup work . But you said it may just help to make a brake issue mor controllable , right ?
I left a little drawing about what I meant.
/-\ means the back wheels converge in front of their rotation axis (toe-in = positive values), not behind their axis (toe-out = negative values).
Positive values mean always wheels converging in front of their rotation axis.
This is what Leo Grandis told me but it seems it is not a well known argument.
Yes, it should be more controllable !
The fact someone has the bug while not others, lead me thinking it should be in the setup the difference as well as on driving style.