The pads are chamfered on the edge, i reckon what you're seeing there is just that. It would be very difficult to fit them that far out of flatness within the caliper.
Go with replacing the fluid as stated it has a life as it's hygroscopic, syringe the old out of the tank (as much as possible) and pump the rest out on the pedal, it can be bought in different colours too, so you can see when it's coming through when bleeding.
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8.
Bright yellow bus o love.
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