I found some time just before my evening activities, and I did move it closer to the centre. I saw a few percentage points jump in the signal quality I believe, but nothing major. But everything is locked in place now.
Next thing might be to try out a C-band LNB with a conical scalar ring!
Glad you got a bit extra, will help when the signal drops due to the usually causes of signal fluctuation. I know when I moved my 103 closer to the centre I gained enough that it virtually eliminated the dropout/pixelation I had been getting every now and again.