From the header of your Config file, I see that you are using SuSE.
In the new versions of SaX there is the option to move and resize your screen with some mouseclicks.
Just exit all XServers and type as root: sax2
I hope that this will work.
If you don't have SuSE or an older SaX there is the program called xvidtune which looks a bit old-fashioned but works well.
You can start this program e.g. from a console window when you are working in X.
The problem about this program is that it (I think so) doesn't save the values. You have to edit the XF86config file by hand.
Hope that helps and sorry for my miserable English