Hunter vs Ghost-type target

Hi there. I've been playing as hunter and I've noticed that I do very low damage to ghost-type targets (such as Nightmate or Marionette) using silver arrows. I know that ghost element has resistance against everything except itself but today I saw another hunter doing about 450+ dmg with auto-attack to those ghost-monsters, and now I'm wondering how? I used stat calc and tried different stats/weapon/arrows (even immaterial arrows) but nothing seems to work and I can hardly even reach a number of 350 dmg per AA. What seems to be the problem, what do I miss in this situation?

p.s. Sorry for any mistakes in my English.

What cards did you put in the weapon?  Archer Skeleton cards work differently than racial cards n such.  Racial cards add 20% of the weapons dmg.  Archer Skels add 10% of ALL dmg including weapon and the dmg from dex.  Try calcing it high dex, 2x archer skel gakkung that is +9, immaterial arrows.