Looked at the thread at MFK. Boy have not been there in years. It is interesting to see the growth difference in similar aged fish. I believe I have seen something similar in the wild, while fishing up waterfalls in NC. Talking 100 foot high waterfalls broken up every 15-30 feet by deep plunge pools. Plenty of eager natives, all small in the 3-5 inch range, then BAM! A strike from a big fish, 8 inches on up to the largest wild brook trout I have ever caught, 14 inches. A good 60 feet or so up a waterfall. These dominant males apparently rule the roost, and may become fairly piscivorous, keeping the rest fairly small. Maybe they just take the lions share of the incoming nymphs? Not sure if that is what is going on, but in these rarely fished and frankly dangerous to access pools, there appeared to be only a single large fish. Often a kype jawed male that actually looked stunted. Oversized head, smaller body. Possibly in his last year or so of life. I know a stream is more dynamic than a tank, but trout or char in streams often live in a single spot most of their lives. The dominant fish in said area occupies the best feeding site while others hope to move up in line someday.
Very nice looking tank. The fish do not seem to retain their wild colors well, or is that just from the photographs? Maybe a bit of both? If they do not maintain color, it must be diet or photo period related since you are using a chiller. Also if they come from the James watershed, they would be the northern strain, which are somewhat less colorful anyway, but still very impressive looking. They certainly look well fed and well taken care of.
What sort of diet do you keep them on?