I must be getting quicker and braking later as my last track event I too had a little seepage and I can guarantee you mine are not overtightened. I think it is as earlier poster said the seat is just a bit too close to the piston so under high temp it distorts a little and weeps.
I never felt a loss of braking action and only did it after some hard 20 min sessions and smoking brakes but I'm not really worried about it.
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