The problem comes when I try to explain it to somebody else so that they can use the info. I can't be a good baseline for you unless you know all my quirks.
In the OP's test the salted films were less dense and he liked that, so what? Why would I care? If less density works better for him in a given type of shot great, but we can reduce density with reduced time or temp or more dilution or get a similar effect by using a softer paper grade. We haven't even scratched the surface, let alone answered the question of why I would want to use salt.