Consider the dependency between variables that have default scaling factors

[adam-a-a]

Let's document these default scaling factors an issue in case they ever become suspects in a "failure to converge" crime scene. I won't hold this up anymore!

Originally posted by @adam-a-a in #1542 (comment)

[lbianchi-lbl]

This concerns scaling factors for variables that depend on each other, but the scaling factors are set independently (separately).