Dansky According to the manual, dish, as you say, works at equivalent of 1m dish within 26*. If you go behind the 26* limits, of course, reception will decrease. Ku signals in Europe are very strong, so I do not see big problem to go some 10* west and 10* east. Setup 45*E-4*W worked for me pretty well.
Could you show some pictures of your dish? Interesting to see..... there are not so many such a dishes around.