Make sure you're putting that items/markings.cfg file into Feralheart > FHRoot and clicking replace on a Mac. ;) Some Mac users just put it directly into that first Feralheart folder, even though it goes into the folder called "FHRoot." Also, make sure you're putting the items/markings themselves into their correct areas, which is the textures folder for the markings, and the items folder for the items. Make sure you're clicking "replace" when you move all of the files.
Also on a side note: I think you only need that last marking pack, since I'm pretty sure that's the updated one of Mass Markings v2, however someone correct me if I'm wrong.