Using Output Override X on a Fence Diagram

I have set up my fence template with the Geological Description on the right side of the stick, and the user has the option of including the USCS code on the right side also.  I want to set it up so that if the USCS code is added, the Geological description moves over to accommodate it.  I tried using "Output Override X" with the expression <<IIf(<<FENCE.USCS L/R>> = "R", 0.25)>>, but instead of moving over a quarter inch, it ends up off the page.  How would I do this?