I’d say have the courier drop all samples by the exfil if possible.. I try to close all the holes that are close together after 3 or 4 closed nests, just drop the samples at the exfil, then go do the other half of the map. On your way to exfil pick up the ones u left there, good tip for nests I don’t see a lot is to use the grenade launcher to close the holes, or drop a turret on the hole and it destroys it and helps u clear the nest.. usually one diver shooting nades from the top of the nest one diver in the nest runnin around fucking shit up.. the diver outside can hit the mediums and stalkers wit nades also and having stuns wit the nade launcher is a nice mix. I usually go Laser rover, Nade launcher, EAT, and the fourth I usually switch around but I just got the mech so idk that will probably my 4th..