I am trying to install a set of Koolstop MTB pads (dual compound threaded cantilever pads). In the past with cheap brake pads I've wrapped a rubber band around the edge closest to the rider (for the front wheel), squeezed the levers and tightened everything up. This gave me the correct amount of toe in. With the Koolstop pads, the edge closest to the rider actually protrudes slightly (manufactured that way). Yes, I'm putting the 'L' pad on the left side of the bike. My rubber band trick is not working and I am getting constant squealing from the pads. When I lightly squeeze the brake levers and look at the pad/rim alignment the protruding edge and other end (correct end to touch 1st) touch the rim at about the same time. It seems that Koolstop has created a pad specifically designed to squeal?

What am I doing wrong? Any tips for easy installation would be appreciated (these are threaded cantilever brakes). Thanks!