1st mod: c(1) = 100.000% effectiveness
2nd mod: c(2) = 86.9119842% effectiveness
3d mod: c(3) = 57.1037996% effectiveness
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Combat Site difficulty:

Easy : (Faction) Hideaway/Drone Cluster
(Faction) Burrow/Drone Collection
(Faction) Refuge/Drone Assembly
(Faction) Den/Drone Gathering
(Faction) Yard/Drone Surveillance
(Faction) Rally Point/Drone Menagerie
(Faction) Port/Drone Herd
(Faction) Hub/Drone Squad
(Faction) Haven/Drone Patrol
No : (Faction) Sanctum/Drone Horde

NOTE: Each site has 4 versions and each version has 2 varieties. Versions in terms of difficulty is (easiest first): Normal name > Hidden (Name) > Forsaken (Name) > Forlorn (Name).