Oh, I forgot to add an important step. To check for doneness, prior to saucing, use a pair of tongs to pick up the ribs, bone side down, at one end and slide the tongs to the midpoint of the rib rack. If you see the rack bend about 75degs without breaking and meat at the top just about to crack open, they're done. Proceed to sauce at that point and follow the rest of the directions.
I typically use this test rather than the pull-back method as there are times where I don't see any pull back even though they've already passed the bend test. Once I did get pull back, the ribs were way too fall-off-the-bone tender, which is not my preference.