I agree on using fab parts in Revit to make the conversion, it's the next part that gets fouled up.
After I make the .rif file and bring it into CAD, most of the parts come in, as shown on the screenshot. However, instead of a length of pipe between fittings, the program stops well short of the next fitting and places a coupling and a large gap.
My thought was if I had a .map file with all the proper abbreviations that it would come in "smoother." This was a few years back that I remember doing this, but I thought that was the answer.