I'm no expert, as I gather most of my info from the veteran experts on this forum, but I don't foil. No science behind it, I just don't. I should probably try it some day, but, meh. I'm happy with my results. I would think that it would help keep it moist if you are running into dry meats, but I would also think it would soggy up the bark. But then again, I don't have proof because I never tried it. Never needed to speed it up SSO bad that I couldn't wait. I tend to over estimate my times anyway and eat early.
noob to q <(+_+)> Char-Griller Pro Deluxe Charcoal Grill; UDS