Moving the asym spin tack to windward is a trick done on bigger multis (F-boats) for lighter air and heavier air, where driving the hot angles to make the spin work doesn't always pay off. Moving the tack to windward makes the sail work a little more like a symetrical, allowing you to drive deep. Something some of the f boats seem to have figured out when sailing in those conditions against monos with symmetrical chutes. While they're sailing hotter angles faster, the monos are killing them by driving deep. Would this pay off on smaller lighter boats? Maybe not so much in heavy air, but in light stuff it just might. The thing would be to drive deep with things bagged out.

Being able to move the asym tack to the lee would definitely help in trying to carry the spin at higher angles than normal.

For a bouys course this would definitely be more hassle than it's worth, especially one design. But, on a distance race...