The three 3-2-1 method is 3 hours in the cooker, 2 hours wrapped in foil, then 1 hour back on the smoker not wrapped.
You can spray with apple juice or some other concoction of your liking to keep the ribs moist. Make sure you spray some more right before you wrap your ribs as well. Of course all ribs are not the same hence there is no real cookie cutter way of cutting them. Do what you think it right for your ribs. If 1 1/2 hours they were at 170 then wrap um up immediately, smoke for some one or two more hours, unwrap for making 30 more minutes.
Adjust the method to suit your individual needs.
By the way. Where you do spars or baby backs? That will also make a difference in your cooking times.
One way to ensure you have some tender juicy ribs is to (1) introduce liquid to your ribs as they cook. I spray mine every hour with apple juice (2) twist the bones. If the bone twists, gives way and the meat is pulled away from your ribs then you have a keeper.
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