It is actually very simple to raise the clearance of the outer presser foot: loosen two screws, adjust to the height needed, tighten those two screws.
For the inner foot: loosen one screw, adjust height, and tighten.
Ed, the screws i was talking about are the one in this quote.. did you make the holes longer for the adjustment or is there room for that adjustment already for up and down height of the feet..