
Here's a photo of that "sea gulled" hull shape you noted, and yes it's an interesting design, with fairly flat aft sections. I totally agree about the deep-V hulls being slower due to increased wetted area, good solid physics.
Depending upon where you live and boat, I'm sure someone with a flat bottom would gladly trade for a deep-V, and vice versa too. Running a deep-V on the inland waterways would be a recipie for fuel consumption most people wouldn't want, but out on the chop that Bertram is right at home.
Paul