I never have seen the message "correct signal found" when I would peak the dish in the past.
This message appears on the 315 Options 6 3 1 screen when you enter "4128" in the Provider ID. I have made this entry several times today to see what happens, with no problems. Upon pressing Options 6 3 1 the Provider ID box reads "0" and the large rectangle directly below it is grey with no message in it. As I begin to enter digits, the rectangle below the Provider ID turns red and says "searching for signal". Once I complete entering "4128", this rectangle turns green and says "correct signal found". The Satellite box reads "A4". At that moment the Signal box & bar jumps up to about 78 and a constant tone is heard. (This tone would degrade to an intermittent beep at lower signal levels. The slower the beep, the lower the signal level.)
If I exit this screen and then return to it again, the Provider ID shows "0" again and the rectangle is grey. The satellite box shows "A4" and the signal box/bar shows 78. This is evidently the "default" status of this screen.
If I understand you correctly, when you performed the procedure from Options 6 3 1 that I describe above, you did NOT get a green rectangle saying "correct signal found" and the signal box/bar indicated a level of only 21. This is too low and it tells me that you are not correctly pointed at the Anik Satellites. This is also supported by the fact that you cannot maintain a green satellite icon on the front of your receiver. That being said, if rotating your dish east or west a little bit does not improve the signal level SHOWN ON THE OPTIONS 6 3 1 SCREEN, then we need to back up a step and decide if your method of initially rough-pointing your dish is at fault. As I recall, you said you were eyeballing it based on the position of a second dish at your location. You may need to consider using a compass to initally set the azimuth.....are you checked out on how to do this? Remember that you must convert the "true" azimuth shown on Mike Kohl's site to "compass" azimuth
Another thing to think about: the antenna mast must be plumb. If not, then the settings you have made for elevation and for skew will be incorrect, even though they appear correct on the back of the dish.