nice job on the cook. 3-2-1 is for spare ribs @225. 2-1-1 is for babybacks. That said, it comes down to personal opinion and taste. Just use the timings as kind of a guide. If you want them fall off the bone, give them more time in foil or cook them longer overall. If you want a bit of tug off the bone, less time in foil or less time overall. Play around and experiment with it until you find a method that you like.
How did the butt do ?