its toed, I think you want the back of the pad to touch first then the rest of the pad? I dont really know, I just play around until it doesnt squeal.
It could be crappy pads, if they are cheap pads (if they are tektro brakes go and change the pads now) try some kool stops or dura ace. My next set of pads will be either of them (I have reasonable pads now not the best but they dont eat the rim and work pretty well).

Make sure you lightly lube the calipers too. On the pivot joints. I use light machine oil.