Not loosing ANY picture.
The internal grid grnerated by the projector is basically the RASTER area. In my insatllation the internal pattern over projects my screen and spills out on to the wall.
I am using a THX Optimode disc to do my convergence. And basically these test patterns fit my screen size correctly. This for one is because I am using a line doubler and running it through the RGB input. The internal patterns are really only good for composit video only. You will notice if you are running the projector with a doubler or a source through the RGB input(s) the HI SCAN LED will light up. If you then hit the test switch and check the internal patterns the HI SCAN LED goes off. So this really isnt that presice for setting convergences when your going to be viewing higher scan freaquancies any way.
I have seen this test pattern "spillage" on BARCO's too and other projectoro installations so I am comfortable saying that this is normal. As far as the test pattern not showing the edge marker I dont know why these projectors do this? I cant even say why I get the top bottom and left screen edge marker and you get all that except your gettin the oppisite sides then mine. ONLY thing I can think of and it just dawned on me is, if your projector is set for rear projection and all your images are reversed then your in the same boat as me and you just need to change the phase of the tubes to get it to project the video images correctly.
I am thinking that you see your video images correctly right? If you notice that the image seems "inside out" (phone numbers accross the screen are backward) then you need to change phase.
Other then that the simple way to see if your gettign the whole picture

is to look kdirectly into the lenses and see if you see the correct aspect ratio right on the tubes. If it looks like the image is missing somthing it may not be centered correctly and your loosing somthing. See if the test patterns are also centered on each CRT.
Oh, and what format are you running as far as input? Composit or RGB?