Hi Ahren,
Instead of placing each address field in separate sections, why don't you place all of them one below the other inside a Text Object?
When you right-click the Text Object, select Format Text > Common tab > Check 'Suppress Embedded Field Blank Lines", the Text Object will get rid of any Null or blank address fields and show one below the other.
You can then place this Text Object beside the other fields in Group Header 1a and uncheck the Underlay option.
-Abhilash