Thanks! I took the RPM readings with my trusty optical tach that uses reflective stickers. The pressure readings were from my (work's) combination air meter with a 0-1" W.C. pressure head installed. That is why I could not report pressures for the higher RPMs. I have a 10" W.C. pressure head, but did not want to change after I had taken so many measurements (I ran each test three times).
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Do you plan on trying out various heights between two fans (with one that's counter-rotating), and running the same tests?
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Yes, if I get a 6" CCW (reverse rotation) fan then it would be a good idea to try a few different heights.