I have not read thru everything.

Take your point about cost, but if you look at it from the point of it being a choice prop and not part of the testing - I mean theres enough evidence here for you already that says this is a ideal prop for fun fly use on this motor, then you are saving on the cost of a selection of woods,,,,,,,, just dont break it !

Dynathrusts are stiffer yes but they are heavy and dont have an efficient blade shape.
The only advantage I see in them is that they look more like a real prop - i.e. for scale and stuff.