I wrote my guide for a guildmate that was struggling with the whole UI thing, I use a lot of words because I am trying to explain it as simply as I can without assume any prior knowledge
When you log into the game EQ2 creates the servername_charname_uisettings.ini file, which contains all the window placement info. You shouldnt need to do anything with that file unless the UI you want to install has a specific file for window placement (ie ProfitUI Reborn) in which case you need to take the one that comes with the UI and rename it to your servername and charactername.
What is the issue with the eq2.ini file? have you created one? does it point to the correct UI subfolder? is it in the correct place in your directory structure?