The Acer XV Mini is a nice head. It probably has the footprint of a 380cc driver, or thereabouts. But it's much shallower. I can hit it off a good lie on the deck, or if it's sitting up in the rough. If you mostly hit the 3W off the tee, then it could replace both driver and 3W. The larger footprint doesn't bother me off the deck, though I know others don't like it.
I've always had some trouble with drivers, too. I've been using a Yamaha D201-S 11* with a Matrix 7321 shaft and when I tee it lower, it's been performing for me. Teeing it high and playing it further forward seems to be what throws me off. A higher lofted driver which you can tee a little lower might help you.