Communications and Ventilation are WAY to small. If marines spawn in cargo they get trapped in those 2 hallways very easy. Either find a way to widen them or remake them from scratch.
To beat xeno all you have to do is keep your armor at full and have a comm that meds. Then the skulks will just be dying over and over again killing no one. If they are smart and xenoing together then you need to start spreading out when they engage…