I'd check the CDR setup first, make sure it's nice and clean, spring isn't broken. Next, make sure your air filter is clean - Think, the purpose of the CDR is to prevent runaway at a high vacuum level(running on fumes). You have a plugged air filter, turbo starts drawing enough of a vacuum to close the cdr... now you've got pressure in the crankcase that can't go anywhere.
Also IDIs produce a ton of blowby normally, which goes through the cdr. A brand new engine still does it, due to the ring gaps as designed by international.