Also remember if you are going to use the Acufeed 1/4 foot the needle position has to be at 5.5 to get the 1/4" seam allowance.
I only use the Acufeed 1/4 foot when putting blocks together because of the thickness of running over all those seams. Otherwise I just use the 1/4" and the single stitch plate or if you have the 7700 the auto plate converter to a single stitch.