I couldn't respond directly to your post, perhaps because you typed too much text in the Subject box.
Here's a response ....
If you're getting any DirecTV channels with that D10 then the dish is correctly aimed at the 101º satellite.
But many SD channels now are either "letterboxed" (black bars across top/bottom) or "cropped" (picture chopped at left/right sides) in order to provide a suitable image for older 4:3 TVs from the single 16:9 HD video feed. If your TV has "video size" or "format" settings, you can use the TV to enlarge the video.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.