I share similar observations with Stratocaster. Ocean conditions and where the fish were caught seems to make the difference in terms of size and strength of the fish in my books.
I fish a high elevation lake where it has its very own natural population of rainbows, probably offsprings of the T steelheads. It was planted with hatchery fish in the early 70's because of a few poor spawning seasons and heavy fishing pressure and the augmentation continues to this day. At the beginning of the planting the old-timers were pissed because they think these hatchery fish were inferior to the native fish and once these fish started spawning with the natives the characteristics of the natives, namely size and strong, hard fighting quality
would be gone forever. I was not there to catch the "natives" so I cannot compare, but pound for pound the rainbows there still give me the best fights, especially the maiden ones in comparison with other lakes. As to the size of fish, it varies depending on whether if the lake is over populated(good spawning season)and the amount of feed available. In the last 30 odd years, there had been quite a few spectacular seasons and a few poor ones(small fish but plenty).
Perhaps I shouldn't compare lakes and oceans, but here we are talking about genetic distinction and the lost of it. I am not a fish biologist so what I say mean little. The way I see it, with this "genetic distinction" on the back of everyones' mind, no biologist will dare to try anything radical to save the ECVI streams, or the T for that matter.
As I am typing this, I see my fig tree outside in my garden. This season it had given me more and bigger fruits than ever, the fruits came earlier and the season lasted longer. All I did was to mend the soil, water it and watch out for bugs. The rest is up to, dare I say, God.