Final results are in! 5:45 total cook time. Ribs came out moist and very tender. I detected a little too much saltiness, but the rest of the family didn't. Next time I brine ribs, I'll back off the time to about 6 hours (instead of 18).
Overall, the brined baby backs were a success! I was impressed by the firmness, and moisture, that the brining provided.
I've also included a shot of the 1 1/2 racks that went into FoodSaver bags. They're going in the freezer; they'll be a welcomed sight on a cold, snowy winter day! I'll thaw them, and heat them in the oven, and enjoy BBQ in the snow!