I blanked off the EGR after the cooler when I reached about 2000km on the clock. Later fitted the electronic EGR defeat as well, mainly to keep the throttle flap wide open.
Never had a catch can or crud build up.
I would ditch the can and go electronic EGR defeat and it'll be happy days.
My biggest worry with the catch cans is possible restriction to the crankcase ventilation, whick in turn could cause seals to fail. You might need to get oil cleaned out of intercooler every few years.
The oil vapour getting to the engine is no problem.
Don't let the b'strds get you down!!