There's a known issue where those enemy types (bosses, rogues, cultists, sniper scavs) don't spawn when using SWAG. The developers behind that mod have an ongoing thread and are working on a resolution. I notice you have both SWAG and Better Spawns Plus listed, which are conflicting mods. I don't have any experience with Better Spawns Plus, but I ended up removing all of my spawning-specific mods and using the algorithm Questing Bots has for spawning bots. You'll need to make some tweaks to that config file if you choose to go that route.