BMW Z4 GT3 @ Mugello

Hey guys!
I have a race in a week, in Mugello. I chose the Z4 in the start of the season, can't change it. THe McLaren is faster by quite a bit, and I'm lacking the speed in the corners on Mugello, and the tail likes to slip out under braking for basically every corner.
Can anyone please share a good tune for the Z4 GT3? (I don't mind a little oversteer but nothing uncontrollable please)
Thank you, and have a lovely week!