Superfish child padding

I was searching for a whole day how to modify the child in superfish menu.
I wanted to get it on text-align center, make it to pop-up in the center of the parent item and after many hours I did it. But there's a small problem that I can't solve. I wanted all of the children to be one-line each, and not to break the sentences. I did that by enlarging the width of the #superfish .menu ul but there's now a lot of spacing at the right and left of the children. Check an example at new.artecniko.gr