Here's a patch srface from rhino so you can turn on control points to see what it's doing. I still got a little "dip" in my tangent connections, but I think it was more of a poor choice for UV count to produce a good surface. I later tried 9x9, which was using the compound of 3 to get more equal. It "looked" like a better result. I would certainly have to study up on it to use it well.