I suppose this is a consequence of the Shapes being too close (and I'm not able to tell the arranging engine how to make distances larger)
Even using the Avoid=true, the connectors are drawn over the shapes.
I'm sure I'm doing something wrong but I don't know what is there a way that I don't know to tell the layering engine a Padding around the shapes so that the connector have enough room to avoid passing over the shapes?
Hope you have some suggestions.
Thank you again and sorry for the number of questions.