You should be able to adjust this by tilting the pj up or down. Having to mount the pj to the left or right is what lens shift is meant for. If your top or bottom is larger, tilting the pj up or down should fix that. You don't need to remount or move the pj.
Are the upper corners equally wider on both sides? If so tilt the pj down a bit so the lens is in the same plane as the screen. Use lens shift to bring the image back up.
Keystone should always be a last resort.
Last edited by curlyjive; 08-26-2014 at 04:43 PM.