I see nesses as pulling from energies and playing off of one another in pairs. As in, if one thing takes a ness, it also has in that range the opposing ness. That way they can increase or decrease in that spectrum. So take your ideas for complexness and simpleness. They are 2 nesses on the same spectrum.
It seems there are also all encompassing nesses that effect each one. Effectiveness - How far toward one side of the spectrum you are.
Specialness - Well, I'm not exactly sure...maybe this is a category label for nesses that are special. Literally "special nesses".
Edit: Like foodness would be considered a specialness.