Yeah I have the cheap canti front rack also with a medium wald. Problem is the medium wald doesn't really cut it for the size (maybe if I got the bigger wad) but then that would be too wide for the handle bars!

Even on my current set up doing about 15lbs a day causes the rack to slide of the strut.... So i'm looking for something with a beefier strut and porter racks are the only ones I know.