Hey guys, i got around to upgrading my brake pads a couple of month ago. The original ones were stock and i switched them over to Kool Stop Dual Compound Mountain Pads. The rims are Velocity dyad. It makes the most horrible noise whenever i brake. Visual inspection reveals the actual rubber compound is building up on the rim walls. The walls are not machined and i expected them to be pretty much down to metal by now.
Any information before i proceed and probably do something stupid??

Blue skies,
kelvin