3-2-1 too fussy for me. I don't sauce my ribs during the smoking process. I dry rub, and provide sauce at the table. I usually provide a few different sauce choices. Those who like sauce can add it in the amount, and style of their preference. Some folks prefer dry rub only. Me...dry rub, and only a TINY amount of sauce per bite as a condiment/enhancement to the porky goodness.
5-1/2 to 6-1/2 hours at 225, wrap in foil and rest 1 hour or so.