Sean,
You quote some thust values. Where did you get them? measured? estimated? calculated? how?
I have used
http://www.lcrcc.net/thrust_calc.htm
and what little measured data I have found says the link calcs are way high. I would like to see more measured data so I can calibrate the calcs. Did you find the link shows thrust is independent of pitch for a given dia and rpm? That doesn't seem right to me.
I will try to rig up a thrust measuring setup and gather some info at my club.
I would like to hear if anyone has a better thrust calc method.