Certainly, Doug. Too much reflex acts unfavorably on the CL max of a blade section.
For this reason, it's not a good idea to choose a more pronounced reflex than is just necessary to conserve Cm0 =0 (such graphed)
Igor Bensen had however, initially chosen a cruder reflex (very positive Cm0), because he could set them at a very low pitch, making them easier to launch by hand. As the speed of rotation increased, they pitch become suitable again in flight, thankswith wooden blades that were very flexible in torsion,
With today's common prelaunchers, and our stiffer blades, the best choice is Cm0 about 0.
Many home made thought they could benefit from the low friction of a laminar boundary layer by set back the maximum thickness of the section on the chord. But the pros of helicopter manufacturers never made this choice (None NACA 8H12)
Below, the latest selection of blade sections by Airbus helicopters: ONERA OA 212
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