On barbecue tours, it's better to plan a break for the middle rather than the end. We learned that valuable lesson on a recent Saturday during a 100-mile, nine-hour excursion to four places in and around Fort Worth. Since the stops were close, all the eating was stuffed into five hours. Even our biggest eater, Gary Barber, couldn't keep pace. Barber (a multimedia editor at The Dallas Morning News) ate a half-pound of sausage, a quarter-pound of brisket and two ribs at the first stop, Off the Bone in Forest Hill, at 11 a.m. By our last stop, Smokey's Barbeque…