I have zero item rarity, have zero problems with drops. I use quant tablets, rare mob maps via the omens and then item rarity deli.
Do whatever you want but this is what I do, juice the map to 1 revive left, chaos with omen, preserved vertebrae for last mod and deli it with greed, then reveal at the abyss. I go for mark for death, natural rares have abyss modifiers since I have headhunter, and then I always choose overrun and sell those because they will pay for your juiced maps, also always having rewards is great to run in your own maps that are naturally overrun.