Mine are all straight Ernie. In knife edge it would make the upper SFG closer to inline with the path of the plane but make the lower one have a higher AOA.I cant see how this would help any in KE flight. Now in HA flight, like in a Harrier this would make a low pressure area at the tip of the wing in the AILE area. Would this improve wing rock problems??
Don't really know just spit balling.

david