Made a little progress - Got my Theta to step, and got my Phi to ramp.
Got the increments to work out better, and that seems to have fixed most of the
mismatches - but there are obvious holes.

Still looks a bit weird, though I unexpectedly created something that gives a
nice twist to the surface.   Increasing the number of subdivisions of Theta
increases the twist.
I probably couldn't do this if I was trying to - but it's a happy accident,
while I search for the method of giving nice, even, regular subdivisions of the
surface.

There is still that strange behaviour of the coloring around Theta = 0.

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