Dave,
if you can, rerun your chart to add a column for Ct/sigma, and you will see that the wide chord blades are running at the same Ct/sigma ratio, because you are running them slower. The point is that they have to run at a significant angle of attack, so wider blades must be run slower to keep the ratio of profile to induced power in the optimum range. If you slow all blades down and look for which blade gives the least power for thrust, it will probably be the skinniest blade run at a somewhat higher speed.
Also, take just one blade and vary the tip speed to see what the power does (again, show Ct/sigma) and you will see that the blade uses less and less power as you slow it down until Ct/sigma gets to about .12
Also, use some parametric for blade weight (perhaps blade volume would be a good first approximation?) so that you can see the influence of blade system weight on a designer's task. My guess is the fat blades weigh far more than the skinny ones, which mean the head, shafts transmission housing and mounts all weigh more to support the higher loads.