Are you WL'd for P/G at Boardwalk....if so, then you have a better chance that will happen then if you want SV or BW view.....I would also continue to stalk and, if you have extra points, try and pick up one of those nights and adjust the waitlist.
Or, if you have extra points, put in a wait list for just the night of the 22nd and if that fills, then adjust...unless, you wouldn't want to move for just one night if only one of the nights filled and not the other.....