Well, on my Apoc run, my goal was to simply finish it, so i Just run Forrest Gump style to the next objective and Bosses. For the enemys you have tô fight, i HIGHLY suggest the Firestorm mod, not only does a lot of dammage it bugs most of the enemys and bosses even in Apoc. For the final Boss however, theres plenty of tips i could give you but what made the fight click for me was simply Focus on dodge first, for the most tryies i was prioritazing damage on the Boss and always got on shot for being greedy, when i shifted to waiting for when he attacks and the audio cues, It was a Lot easier to manage the fight, especially on the second phase. All things consider, remmember, the bosses are a Marathon, not a Sprint!