Any new prop info?

[Idylles15.5]

I'm aware of the big 15 prop test, but that was done in 2009. Going to finally make a purchase of a folding or feathering prop. The old test says the feathering is the way to go, but even feathered it makes a nice place for lobster pots or other debris to snag, whereas with the folding it lines would slip by. Any new tests out there or technology I'm not aware of? I have a 51 Idylles, 80 hp Perkins. Boat will do 8 knots with the fixed 3 blade. Its definitely dragging the boat down under sail.