Your dish bracket is upside down, swap it around, the pivot bolt is always at the top.
Now if you set your motor lattitude to 52 and follow the procedure as earlier posted, you should be able to find 1W and your arc will be correct.
NB: The lattitude setting on the motor body is not negotibale, it has to be set correctly, otherwise the arc will be incorrect.
PS. You don't have to link to photos, you can go into advanced posting and add them as an attachment in the manage attachments section, it is a pain to keep having to open new windows when trying to view a picture.