What normally happens is batmakers will bone the edges flush on the edge and also the corner of the face/edge. If you're having to bone the back of the edge, I'd recommend looking up the double sided GN T20 bat, as you really shouldn't be hitting it there at all, (Like even more so than the toe and edges) but it's probably the only bat designed for you to hit the ball there too.
In terms of aerodynamics, unless the wind is blowing down directly on your bat at high speeds, I'm not sure how that would even come into play? When you swing the bat, if there are any significant aerodynamics involved it would be on the face of the bat, in which case a rounded face would give more batspeed? Otherwise we've all been shaping backs wrong, and flat faces are wrong, and should just go back to the old style Mjolnir/Purist type shapes haha