I don't foil mine until it comes off... fat side down during the cook. Watch the temp spikes, and keep it at 250 or less, though some swear by the speed method, too.
CBJ, some comps, a few awards, Certified Artisan Steak Taster.
XL Big Green Egg, Bubba Keg Convection Grill, Weber Kettle, Charbroil Infrared and mad livefire cooking skillz! :)