Brake disks all have various different designs and shapes to suit all different kinds of usage but a theory that i discussed with Ghost when he had simmillar pad usage problems was that the edges on the cut aways on his discs were knife edged and not chamfered, therefore every time the brake was applied, the pad wear was accellorated. it may just be worth going over your disc and using a dremmel with a small grinding stone chamfer all the edges that come into pad contact and see what effect that has on pad life? hope this helps
