Great thread with lots of info.

One general point to make here is management.

Every species has its traits , uses and +- .

The management issue is - while we know the traits of each species individually we really don't know what happens when they all get together. That is why multi species waters(natural ones) like reservoirs or river fed waters are so hard to manage. There are so many variables just between species not to mention all the natural factors like weather. The more variables present the harder to manage to a specific goal.

It would still be fun to roll the dice and watch - just don't get frustrated about reaching the goal. Goals often change.