yes your set up is correct. However from what I can tell little oily air is spent through the crankcase breather anyway, when I have had my CAIS off and filter off, the outside of the throttle body is spotless. Mountune now supply a reducer for the pipe so on full regular throttle (track days) less oily air is sucked through into the filter and inlet. Mountune cars do run lean though. Mountune run the breather back into the filter I think for environmental rules.
Maybe take your breather pipe off and see how oily it is inside, options are just a tiny filter on the end but then you will have incabin smells or proceed with a catchcan set up.