I have no idea why the grass shrimp are doing so well in my pond. I bought a 20-pack from the ebay dude and dumped em in. Now there are thousands of them.
The Virile crayfish that came from QA's pond are indeed that, and to my thinking, are the main reason that my RES are in such good shape.

Went back and did the Wr calculations on the fish I measured the other day.
The BG were both 110%+
The RES was 125%+
The HSB were both 100%+
The SMB, on the other hand, would seem to be about half starved to death, although he looked to me like he was in good shape.
I suppose it's possible that I recorded the weight incorrectly.

Finding Wr calculator spreadsheets made that super easy. Those will be a great tool to track what's happening in the pond in the years to come.