The spawn rate is atrocious. I really don't want to do this bullcrap. It is NOT fun. I've seen $0.99 mobile games that were more fun than this crap. Seriously DBG get it together. My member ship is already cancelled. I had Ops with my outfit last night but only logged on for that. I'm usually playing this game for hours a night every night. Right now I'm logging on, dealing with this BS campaign until my patience exhausts then logging out. My interest in planetside is finite and this BS is exhausting it fast.
Think they respawn every 5 minutes in batch. Got my 100 yesterday in ~30 min total. It's not fun or engaging, it's still a bad mission, but since they fixed the spawn location it's nothing I'd lose any sleep over.
Have you tried jumping around to the different jungle areas? They might take a little bit to respawn but are you sure you're not just missing them or getting beaten to them? Are you wearing the special implant?
