Since the 300C's have a projector beam, Ive been told, that you get a better cut-off than from an open headlamp....
So no, I just-pluged-n-play
And like I stated earlier, the fogs are so low, Im not too concerned with beam scatter...
Try talking to some of the other guys with the factorone kits in their mags and chargers...since its an open headlamp, they might be able to help you with the adjustment question better than I can...sorry!