Adjusting the linkage on the blade grips - shorten the high blade linkage to bring it down. I tell you, it's beat up blades causing the tracking issue! They track differently at different head speeds. When I put a new set of blades on, I bet I can get them right on.

EDIT
Sorry - you SHORTEN the high blade linkage to bring that blade down (unless you're standing on your head, or you have a head where the flybar is BELOW your main blades!!)