Tubulu,
You need to be very patient with the adjustments. I am talking .010" at the time. First, try to get the dish azimuth to the best quality you can get. Then play with vertical alignment. At some point, you will get it. Trust me, I went through same thing. See my post
http://sadoun.net/viewtopic.php?t=5060, it might help you.
Alfi