If you remove the media from the side you use as the outlet, then it will work app 10-20% more effectively by not holding that oil satuarted media right at the outlet so it is all suck right out (like a wet washcloth will if you suck on it).
The other issue you cant correct is the internal volumne is so small that the speed of the flow through cannot slow enough to allow the droplets that are dripping from the inlet chamber to not be pulled along (like a straw and spilt soda on a table if you suck on it).
So, it will catch oil (even a beer can does catch oil, so you cant judge by "it catches oil".
So try that, and just for the heck of it install a clear glass inline fuel filter between the outlet and the intake manifold and post pictures.
At least your doing something to reduce the oil ingestion.!
