Well, over complicated in terms of mimicking the big engines... what you state is true, simple... recirc' blowby on the atmosphere side of the throttle valve / plate works better than on the manifold side... but PCV properly implemented, requires a bit more than a one way check valve as the crankcase breather pcv, and a small orfice in the intake runner... especially with a single ringed piston... tight tolerance engines can get away with a small fixed orfice PCV system... but a single ringed piston with a check valve acting as a PCV valve.... a small orfice in the intake track that can't pass the blowby volume in the lower rpm range with ring collapse... it causes inconsistent fuel mixture.

Remember the GF40 is a positive / piston driven forced ( with a check valve ) PCV system... there is no relief path when the crankcase positive breather system is over pressurized by excessive blowby.