Hovering has little to do with the wing or shape there of (aileron size and how close they come inboard has more of an effect)

As Capthis said, the A/W Edge is VERY solid in a harrier. It just doesn't want tip stall which obviously is a good thing when learning to harrier. If you get it in an odd angle of attack or not in the proper forward air speed for that specific angle the wings can rock but won't tip stall. It will just want to fall forward before it drops a wing. With that it mind, it's one of the toughest (if not THE toughest ) planes to get a good spin entry (Hence why the Extra is a better sequence plane).