There needs to be one line going in and one line coming out for the motor to breath. Plastic cover still? It may be cracked. (I have an Aluminum one to put on mine yet) If one or the other line is missing/plugged off, the oil will fly because blowby builds up in the motor.
Make sure the PCV line is clear (if you have a solenoid in the hose, remove it and put a new hose on) The other one should be an open breather line to the aircleaner. If you still have oil flying around, the valve cover may be clogged underneath. (check all your pushrods are moving correctly while it's off)
What oil are you running? I switched to 15W50 Napa synthetic and cut the consumption by half. (almost zero exhaust smoke too) It ran well before that (no miss)