Try changing the number for the Y co-ordinate from 14.01 in the CollimationData line. I'm pretty sure that is the one that moves it up/down.

<CollimationData>0.0,14.01,4.72,0.150</CollimationData>

Copy the coordination info to another line (something like this: <!-- CollimationData 0.0,14.01,4.72,0.150 -->) so that you know the starting point. That way you can go back to it and start again if necessary.  Well that's what I do, so I don't get it too messed up. ;)