You didn't bed your pads. Light driving won't do it. You have to get the pads HOT so that you get a layer of the friction material on the rotor surface.
Otherwise, you won't get very good performance from your brakes.
Then if you lost a lot of pad, it was probably because you didn't bed in your pads before you drove on the track.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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