Hello -
Ok, I watched the videos over and over and took some snapshots of what I thought was representative :
Now, the rain drop is most likely the way to go, but I was intrigued by the "stability" of the top part of the third design above. It "looked" like it's not turbulent, but maybe all it's doing is elongating (i.e. postponing) the turbulent wake. And larger volume wake = bad, yes?
CarloSW2