Hey guys
This is a bit of a long winded question, so bare with me please.
I'm building my own version of a pipe generator.
Most of my work is based on:

1: The procedural modeling videos by Ari Danish

2: http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=21231&sid=828819956b055ae66950333bd07679d4 [sidefx.com]

3: https://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=34710 [sidefx.com]

None of these however have a good solution for creating evenly spaced elbow joints.
I would like to control the carve u-value with a sphere generated on each elbow joint, but I have no idea how to do this.

I found this method, but it doesn't work on my curved curves. it only works on 2 point lines as far as I can tell
https://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=27190&highlight= [sidefx.com]

Here is my file: you can see the system is working to a degree, but I have no way of controlling the elbow size in world space.
Could someone smarter than me (basically everyone on this forum) take a look and offer some advise?