Arrrrr, OK I think I am understanding this prop a little more. I looked at the video on their site.
What it looks like is that the pitch
is actually set by the blade design, not the angle it sets to. It is not a "self pitching" design as such but more accurately a self feathering design. So it is important to get the right blade model for your boat/engine and the correct blades and most importantly all three blades MUST be identical in pitch.
With the blades set so far back over the hub, I now understand how the prop could have enough fulcrum to bend the shaft like that. The driving force is developed a long way back at the end of the shaft and not up close to the bearing where most fixed blades are sitting.
From what I have seen in the specks, I think you should have an H5 to H6 and a pitch ratio of around 430. How does that match up to what you have??
I strongly suspect one blade is incorrect.