Mike,
you must have a pretty good spring flow to keep the trout happy with a 9ft pond depth. did you start the experiment with trout, or did the previous owner have some? also do you find that the golden rainbows grow faster or the same as rainbows?
Have you considered raising some smaller trout in cages? I believe Cecil,and many other people on this forum do so?
Goin to the cabin for the weekend, talk to ya later. Larry M.