ON the HDTV set up screen what should I be using for aspect ratio to get the best pic possible, first off, I have a 50 inch Philips DLP set..the installer set mine to 4x3#2, but I find that when it is on there the SD channels are stretched so much they look like crap...I set it to 16x9 and the stretched deal is gone and I have the regular 4x3 image on the SD...why would he choose 4x3#2 when he installed my VIP622???