As has been noted, I am not "Peter in disguise" although I did purchase my Titan through him.
My screen is 120" diag. 16 x 9 VuTec Matte White (1.0 gain). Seating distance is 18 ft. Room is 22' x 24' x 20' with beige walls, dark area rug and dark wood ceiling. All windows are sealed against light intrusion, but the room is multipurpose, and not totally dark. Projector is 19' from the screen and mounted upside down, with the center of the lens even with the top of the screen. Upside down mount is not necessary, as the lens is symmetrical-the up/down shift capability is identical. Ideally the projector would be mounted on the center axis of the screen. With this setup I am using about 50% of the lens shift range.
Sorry, but I have no calibrated numbers to report. The Titan shipped directly to me from the factory last July. It looked so good out of the box that I did not consider independent calibration. The lamp has 750 hours, so I am planning calibration after breaking in a new bulb in about 4 months or so.
As to the original question, this is my understanding (caveat: I am a ceramic, not electrical engineer): There is no level adjustment for the DVI input. The Titan syncs to the incoming signal each time a data stream is detected. In other words, turn on the projector, turn on the signal source (DVD player or whatever) and wait a few seconds for the Titan to detect the input - 480, 1080I, 1080p, etc. Any signal with less than 1080p resolution is upconverted. If the signal source changes the Titan detects the new signal and adjusts accordingly. There are other (component) inputs, but I have never used them. As far as I can tell there is no downside to not having an HDMI input, since sound is handled with a separate processor. Someone please correct me if I am wrong.