I have a WS-55905 (uses the V16 Chassis) The picture is shifted slightly to the left in HD and I would like to center it.I have the Technical manual and have access to the menus, but I can not figure out which function to adjust. I thought changing the HPOS setting in PTC Logic would do it, but it did not appear to change, so I did not save it. Is that the right funtion to adjust? It is currently set at the default of 203, if I want t shift it about 3 inches what would be a good starting point. James