Yeah the trick is not to push the blowby through the head - either by bypassing it or reducing blowby, or both. That and reducing the pooling of oil in the head is the key to it.
Problem is there is insufficient room in the engine bay for a cyclone type catch can which would separate the oil/air properly.
Speaking to a few people it can be the last few hundred rpm that is used that makes a big difference to the amount of oil spat out of the engine. Not quite sure why that is.