What you really want are v-brake style brake pads, with the threaded mounting posts and stack of spacers.
If your kool stop eagle2s are threadless post, youre outta luck.
if they are threaded version, you might make them work but that type is really meant for caliper brakes not cantilevers -you'll probably have issues aligning the pads to the rim
you want this kind:
http://www.amazon.com/Kool-Stop-Thin...16334&sr=1-146
note all the spacers on the mounting post
get the pads as close to the rim as possible, and get the straddle wire down as low and close to the tire as possible, this should maximize mechanical advantage
Other brake styles have better MA ... look at medium profile cantilevers instead; avid shorty, tektro oryx