well my friend,
1. most, if not all hunters use Kuko. Ladder hunters do their best to get their Kuko upgraded to elite.
Two-Hand Damage: (25-28) To (72-81) (48.5-54.5 Avg)
Required Level: 33
Required Strength: 53
Required Dexterity: 49
Base Weapon Speed: [0]
+150-180% Enhanced Damage (varies)
Fires Explosive Arrows Or Bolts [Level 7]
Piercing Attack (50)
Adds 40-180 Fire Damage
+3 To Immolation Arrow (Amazon Only)
+3 To Bow And Crossbow Skills (Amazon Only)
its pretty damn neat, the explosive arrows is real nice to have.
2. a hunter uses (could) elemental spells too, i am not a 100% expert, but IIRC, they use the fire tree more. ie: early stages: firestorm, then later stages: volcano, fissure, some uses armageddon. so, that also would be able to deal with PIs. Unfortunately, if you're in a 8 player group in hell, maybe, they wouldnt do as much damage as if you were a pure fire elementalist (they would have 10 elemental charms ideally, but your build would seem to be needing some summoning charms). but i think you would still do a great deal.
3. i think the reason why you asked about amp dmg is because amp removes PI off the monsters right? well, there are other ways you can deal with PIs.
- have buriza on switch
- have chance to cast amp or amp charges (eg. atmas scarab, a pole/pike on a merc that has it, etc.)
- have chance to cast decrept or decrept charges (exist?), (eg. reapers toll would be awesome on a merc because it has 33% chance to cast decrepify)
hmm i think thats all i can remember so far.
i hope that helped.