I am late to the party, but the biggest deal for me when aligning my dishes is getting the dish mount to point true south. That will cause you to miss huge areas of the arc belt. I would go to your western or easternmost sat and loosen your dish mount bolts on your pole. Try to ease it back and forth just a slight bit to see if your signal levels increase. You should leave your elevation angle and declination angle set on what the calculators and tables give you. Definitely find true south before fine adjusting elevation and declination. You should be able to find more satellites further east and west if the dish is setup properly.