If you want yield, up the light, training, and veg period. From the appearane of all things pot- you always need more light and long veg's. I'd have to second not outcrossing though, as its hard enough to find loompas to begin with LOL.
If you saw pics of Medics candy bushes, you would know that they would not be low yielders. Those bitches were absolutely huge. But that was the deleted thread.
I'll be running at least a couple emperors (hopefully) here shortly in a high watt vert room, so hopefully I can get some yield....the effort will be finding the headband leaning phenos....