I have read some threads regarding saving individual mixes on a dLive c3500 to scenes
What you mean with individual mixes?
Monitor mixes for musicians? Or the entire FOH mix?
General speaking a scene safes everything in the moment it is created
only the filters and safes define the parameters which get recalled
you have scene recall that sets the filters just for that particular scene (block from recall or allow to recall)
and you have global safes, this will prevent the saved parameters from recalling at all.