Then get the key first. I know, easier said than done.Thats exactly what i do but with the executioner level III. But by me they toss infinite nades when i try to escape from roof. When i land then they toss directly the next one. Rinse repeat.
i try to shoot them from the air but once their shield dropped they run in cover. so it repeats over and over again until i get hit too often. No way to use cover as the AI knows exactly what you are doing like a ESP-wallhacker. The only thing i can do it find a building with an ammo crate and cheese them. But you have to get a security key whic is impossible if the whole mob is hunting you.
I've seen mentioned many times here about Stealth Boy videos on YouTube. I don't personally use them as I'd rather learn it on my own. But maybe they can be helpful to you.
What is your hardware?The horrible performance on many bases doesnt make it easier due the input lags. While my CPU runs at 30% and my GPU at 70--80%
What is your controller?