As to size, 16 lb is what we ,and many cook teams, prefer to cook.
Like Smokin' says,we prefer to place it diagonal in the 008,and turn the point under-and allow it to shrink as it cooks.
Some cooks will separate the point from flat and lay it more evenly across the flat to cook.
Some will cook the flat on the rack under the point.
Try it each way,and take notes as to what suits you.