I believe that the symptoms are reduced with each outcrossing. So with every Enigma x Non-Enigma pairing, the symptoms are less and less noticable. That's why you see most of the more popular breeders here stating that it's not a good idea to do Enigma x Enigma crosses. Because there simply hasn't been enough outcrossing done yet.
I'm outcrossing my male this season too, and already have four eggs, so I'll have some first hand information in about a month.