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@TRA
400 klm's does seem to be a silly short lifespan. Too many factors to be sure though.
My front archetype was wearing very fast in every day commuting but I have since switched to swiss stop greens and they have slowed down the erosion. To be fair though I do about 80 miles per week in all conditions and they're still fine 6 months in.
Check if the braking surface is concave and also check if your pads are aligned properly. Pads just grabbing just the edge or hitting the actual rim surface (set too low) can destroy a rim very fast. Definitely worth checking before re-building.