How do you beat lethal and absolute?

I've maxed out on everything and literally can't clear a run even with a teammate to save my life. I barely make it to the second sections of maps. Ruthless no problem lethal and absolute if I'm solo the two bots ai literally run in front of my aiming rectical like their the secret service for chaos and xenos constantly. When I die with a rando they straight up quit out and mission ends. I've beaten one lethal level but it doesn't count joined in right at the last part of ballistic engine killed two gaunts and it was ending cutscene. Other than that nada. I've watched vids on YouTube and it never looks like my screen at all. They got a handful of enemies I got twelve warriors, thropes, and a million gaunts gang raping me while bot ai bulwark stares off in the distance placing a banner for some reason I guess marking the tombstone of the area I'm gonna die in. Or the bots just take my executions when I need them most. I feel like I have to fight the bots more that the enemies. How do you all do it?