I'm not sure you can place incinerators in one area and have it cover entire map. I know initially when I tried that with a dump, it was a big problem because it was too far out and no trucks would leave. Soon as I moved it closer to where I had my population, trucks starting going out to pick up.
I've pretty much allocated a block for a incinerator for every "area". Since if you put any residential within that pollution circle, they get sick. I try my best to put it out of the way, but when I buy next tile, that "out of the way" becomes "Right in the middle of expansion". Haven't had any problems since I started making incinerators for every "area", I also have recycling policy turned on.