Line that bad boy up as close to the boom as you can. Keeping the roatation close to the boom will also protect the mast by limiting the amount of swing and keeping the most rigid cross section lined up with the load. This will also, hopefully limit the whiping going on up there.

Also consider the downhaul: Hammering it opens the leech and exposes more sail area while DDW. IMO, ease it enough to keep the leech semi closed, however you want to keep it on enough to take power out and support the mast.

When it gets hairy and you have to go head-to, rememeber to ease the DH then as well.