While I was in France, I found that in light winds (with the 8.5), once i got going at a reasonable speed, i could get a load more speed up by snaking slightly upwind... so i'd lean backward... feel the kite pulling and lean forward slightly... pick up some speed, lean backward... and so on. I picked up a load of speed like that and still managed to go upwind. Then, as Adrena1in so well put it, you have some space to "blast downwind".
Dunno if n e one else has done that? obviously it doesn't really work in strong winds (tho i haven't actually had chance to try it yet). Oh and it was much easier to do using the handles without a harness coz you could really feel what the kite wanted to do.