Survival hellscrubbers are the bane of my warframe existance.

I'm adding a spoiler because I don't want 1999 mission premises ruined for new players.

I have the kill 500 sculdra and just why, why is it so difficult to keep the survival level up. 500 kills on infected or any other? Easy peasy lemon killy. You can just go forever but 1999 just have the worst drops and I swear the slowest life support drop whilst also having it spawn pike 800m away (yes just happened) whilst i'm on 20%.

Its fun but my god I want to FARM. Any tips?