trying to figure out my projector issues. Am I doing this correct? I am looking at two projectors, inFocus IN76 and Optoma HD72 and will be doing a ceiling mount. InFoucs has a 125% image offset. Basically, from what I understand, the center of the projectors lens will have be 25% above the top of the image. Optoma HD72 has a 154% image offset, so the center of the lens will be 54% above the top of the image....correct? Thank you for the help!