Hi. Tried your mod and already absolutely loved them tearing up my 'death wall' on just mildly higher then stock mod difficulty settings.
Using bobs enemies and having the minor issue of being unable to find 'vanilla' (uncolored) artifacts, when roaming around destroying spawners once I enabled 'new enemies'. Bobs lets you dye them other colors so they are the most useful and are required for some recipes as well.
Also, it seems spawners drop about 1/5th as many artifacts as they do in bobs enemies in general.
That said, I enjoy the mod so much I think I am just going to disable bobs enemies as I don't feel artifacts where adding a huge amount to my game, other then the annoyance of collecting them from the vast fields of bases blown up by artillery.
But if you do ever go to tweak the artifact distribution, I would recommend some more uncolored artifacts and increasing the quantity when used with bobs enemies. By default in bobs enemies they drop a mix of artifacts from each spawner.
I do very much enjoy how you have properly separated elements. I feel it could make artifacts much more interesting then how bobs does it by default (completely random) as you would have to hunt different areas of the map to get different colors, but more uncolored artifacts are needed for bobs mods recipes and general flexibility in crafting/research.