the evidence that "Our Kind Can't Get Much Done" (relative to everyone else) is very weak.

That's fair. This isn't really the point I was trying to get at, though I can see that the post makes it look so.

I'm not too concerned about how effective we are relative to everyone else. I'm concerned with how to become more effective than we are now.

That said, the measurements you describe, as well as most of the measurements here, could be useful to gauge a motivation technique against a control group.