stored find requests cannot evaluate an expression such as $Variable1...$Variable2.
You'd need to put the entire date expression, both dates and the ellipsis (...) into a single variable.
Or you can use scripted finds of the type shown in this thread: Scripted Find Examples
I prefer that format for my scripted finds as I don't have to open another window just to see the criteria used to perform the find.
Thank you so much! I completed an ad-hoc fix and will study the in-depth version eventually.