AutoCAD Civil 3D :: Create Station-offset Label Style That Will Drop Trailing Zeros In Offset?

I am trying to create a station-offset label style that will drop the trailing zeros in the offset section - e.g. 15' instead of 15.00', but if the offset is not at a whole number, e.g. 15.01, etc.  it will display the entire offset.

I created two expressions:  IF(OFFSET-TRUNC(OFFSET)=0,.1/12,.00000001/12)

and this one:  IF(OFFSET-TRUNC(OFFSET)!=0,.1/12,.00000001/12)

I then created two offset components, one called truncated, and one called full, and assigned the heights to match the expressions. 

I have attached the file, the style is ACHD-Sta Off-Rt [copy]

C3D 2011, Win x64