MIK: From your description it looks like you mean to round near the chine... I was more talking about making the rear section of the bottom a bit bended, so that together with the rocker, it will create a more round shape while the boat is in
level. You wrote: "you have to imagine the boat heeled"
Attachment 243767
I made a quick picture of what I mean. To the left is how a transom might look like, and to the right how the water will be touching the bottom because of the rocker and the bended bottom near the transom. This makes it more streamlined which would help in at least low speeds. I was curious of how it would affect the boat in high speeds, as that is what the goat is aiming for.
But the more I think about it, the more difficult it appear to be to achieve this with just plywood, as you can not bend it to such a shape easily without making several cuts into it.