I’m distracted and haven’t looked at your latest code yet. In another thread, @martinsiegrist posted a python spiral thing that was cool and might be useful for you.
That thread mixed up several different concepts so might get confusing… Martin and I had different ways of doing spirals, as he explained here:
my approach with the sporphed spirals results in equal height difference and increasing slope while your loft has an equal slope but the height of the loops decreases.
Both are valid, though they produce different results. I’ll find time to look at your code later; I have avoided it because I wasn’t satisfied with my results three weeks ago. (seems like much longer!)