Yes, I would also increase the armhole facings if the armhole is increased. Because the facings are usually a simplistic shape, a sort of crescent with squared ends, I would add it to the ends. So if you’re increasing 2″, there would be 1″ add to each the front and back facing. If there’s a side of the facing that is “place on fold” it might be easier to add the extra measurement to that side, since it’s usually the straighter end. Hope that helps 🙂