well 80:80 bow means a naked balance of 70:70 wich will end up when fully geared to 80:85 balance wich would give me around 14k hp...
Using snowshield and the knockback skills i think this is enough to survive. A pure str bow with regular +5 bow hits around 5k with strong bow and 10k crit. A 80:80 bow hits 7.5k and 10k crit
