Maybe you can add this, for 2b) Best way to level up? Actively Part 5, I couldn't kill the dual hammers with 1000 acerbatus per shot with a max damage setup (I could only hit 900 damage per shot or so). This was when I was around level 100.
To compensate I just used Melio Macir glyphs Armas Custos with 1 HP left with max damage gear.
With queen of hearts helmet & barbarian body / shoes Arma Custos only gives me +3 damage (+1 str) at full health. But if I enter the room with 1 health I was getting +267 damage (+105 str). Then slap on your death rings and not only does your base damage double but you get +490 damage (+193 strength) in bonus damage. I was hitting them pretty hard, 1200-ish damage, and had no trouble killing them in two swings and after a few minutes I could swap in a hierophant ring.
If you're having trouble entering room with 1 health eat a "rotten meat" when you are below 200 health. And I suppose you could wear the heart cuirass if you feel you might get hit or just want to be safe.
So I guess if you're having trouble killing the double hammers, equip *Melio Macir glyphs *Armas Custos Glyphs *death rings *Max damage gear and enter the room with 1 health