Tinman, I have nearly the set-up you are describing. I have a 115" screen with the projector mounted 16-1/2' back and seats set up so my head is about 14-1/2' from the screen. My ceiling is 9' but I have a drop pole mount so the center of the lens is about 14" below the ceiling, or 94" above the floor. With this location the bottom of the projected image is 21" off the floor. There is some manual range of adjustment for the lens shift, at this distance probably 3-4" inches up or down. I just upgraded to this projector from my HD1000u and other than the offset lens, (HD1000u has a centered lens) it fit my permanently mounted screen perfectly. For those wondering about the lumens, I have a DW screen, which is a matte white material with some gain, although I don't remember how much, in a light controlled room but with a white ceiling, dark red walls, and black carpeting, and with the lamp on low mode and some of the calibration changes mentioned earlier, provides an image that is plenty bright and looks spectacular. A really nice upgrade from the HD1000u for about the same price, but 1080p, 3D capable, and the emitter and (2) 3D glasses.