I misplaced the manual that came with the fan assembly. I think I might of put the blades in incorrectly. Seems to me the leading edge should lead, in its rotation, not drag.

Depends on the fan rotation. Reverse the direction. Now how does it look? In summer it should be angled with leading up. In winter ,leading is down.

Most of their fans have blades can be installed either way. If blades have any wording or numbers by mounting holes, they usually face up. When you say Leading edge like an Airfoil, if so, Bigger end goes into the wind.
I have Fans Blow Down in Summer, Off In winter? Moving air cools? I do understand Heat rises, In that case, blowing down in Winter also makes sense, on Low?