I ditched my z32 for track use two years ago and bought an e36 m3 - have too much invested in the car to be willing to push it at the track.
I ran motul 600 in my z for several weekends braking very hard. Never had any corner boil over. Might want to look into pads that have a higher max temp and need more heat. I had good luck with carbotechs (xp12 front xp10 rear).