Cecil Moore wrote in message

I *don't* expect such a coil to simulate reality. That's the whole problem.
The artificial lumped load software doesn't match reality. It only
approaches reality for "physically small" coils. Once again, a 75m Texas
Bugcatcher coil is not physically small.

It's physically small enough that any error should be small. IE: 1 db
or less.
This has been shown a few times. Myself, I don't lose much sleep over
the phasing coil dilemma. I don't think it will be much of an issue
when modeling simple short loaded whips. Being there is a workaround
for phasing antennas, IE: separate sources where you can define the
phase angle, the antenna can still be modeled.
There is something that keeps bothering me and my beady mind though...
You say the current going "one way" will be fairly constant across the
coil. Will the coil position effect this? If not, that creates a new
problem.
If the coil position does not effect the current taper going "one
way", I don't see how it would coming back the other way. Regardless
of coil position. If the current is constant going one way, seems to
me it would also be constant the other way. So in effect, they would
cancel each other out, and would still be fairly constant. I guess
what I want to see is experiments to test your theory of coil position
effecting the current taper. IE: You claim a center load would have
constant current, but off center would not. Seems to me, if this is
true, there should be a position that places maximum current at the
top of the coil, not bottom. If you never see this, I would be
suspect.
Well, back to my 1 db or less rubber room... MK