Perhaps I should further explain where I was going. With a white ceiling there is little if any detail to register control points from. Since a white ceiling is easy to clone out maybe Gimei could delete the T & B and see if his alignment improves. In his example it does not seem necessary to include these photos in the mix. From my own experience I find leaving out the T & B and fixing later in PS results in a better stitch. You also save onsite photography time and processing time by not shooting the T & B. As a professional making a living from photography, saving any time in the process is money in your pocket. Most of my clients also enjoy the tripod cap because it is more of their branding in front of the viewer. Sorry for my muddied thought process earlier.