" 

 :::Ah ok, sorry.  

 :::No, I don't see how moving that ""point of equal pressure"" forward would have any effect on induced drag, unless in so doing you reduced the lift (which defeats the purpose of the wing) or the distribution of lift in the transverse direction to make it more elliptical. 

 :::If you look at a top view of the wing, the flow above the wingtip is inward and the flow below the wingtip is outward.  This difference in the sideways component of the velocity above and below is what causes the vortex.   "