Sorry but I don`t have time to explain everything
I have exposed all parameters as Numeric or Constant so you can see what I have done.
Basically, the problem is in the Spline position which is good but if you are using Pivots to offset the Segments on radius it is logical to get an Evenly result like yours.
So I have just repositioned the Pivots, create some nested generators, and did offsets in Master Generator so RC has better distribution on Evenly.
You are still going to have some overlapping on sostegno defaults but that I guess that can be solved with Vertex welding (or do one more Base spline for this)
Sorry, I can help you more I have a project deadline