Thank you for using S-UI!
In any case, reinstalling won't change anything.
However, I'm not sure I understand your issue ^^
The thing is, when I code the UI layout, I choose how I want to allocate the binds. There is a keymap in the first post to help you with it. For the BIG layout, you should check this keymap:
The third row uses the binds from Extension 1, shortcut 1 to 8; and from extension 2, shortcut 1 to 9.
If this doesn't address your question, could you send me a picture? Or try to re-explain it to me?