Well, my motobecane fantom came with tektro oryx cantilevers... needless to say stock setup left much to be desired.
First step was to add Koolstop Cyclocross 3 compound pads... HUGELY improved. They had probably 50% more braking surface.
Second step was to add a link wire (pic from sheldon's site)
I made my own link length with brake line
Third was to eliminate the interrupter brakes and the 'elbow' that went down to the wire hanger on the front. Not sure if it was the interrupters or the elbow being eliminated, but my brakes are much better now