Looks like I'm late to the party.
Here are the fiber disks we use at work, you can get them in 6" and 5" diameters, and they eat material, normal grinding disks produce grinding dust, these create metals filings. We typically just put them on top of a 1/8" grinding disk, they don't work if you are using the edge of the disk, but if you use the face they remove a lot of material very quickly.
This should fix your wedges in short order.
Fibre Disc Cubitron II Fibre Discs - 982C, Ceramic Grain, 60+, 5" Dia x 7/8" Arbor NU155 AB27632. Free Delivery on Orders Over $99
www.tenaquip.com