I currently have 12 spot available on my weapon and trinket. I am wondering what the best filigrees would be for an acid alchemist. I have to following currently slotted:

Epic Sceptre of Corrosion
1) Otto's Irrervocable Power: Intelligence (Rare)
2) Otto's Irrervocable Power: PRR (Rare)
3) Otto's Irrervocable Power: Constitution (Rare)
4) Otto's Irrervocable Power: Spellpower
5) Eye of the beholder: Intelligence (Rare)
6) Eye of the beholder: Spellpower (Rare)
7) Eye of the beholder: Wisdom (Rare)
8) Eye of the beholder: MRR
9) EMPTY

Key of Rhukaan Draal
1) EMPTY
1) EMPTY
1) EMPTY

Looking for any and all suggestions on what I should put in the empty slots and/or change the other sets.

Thanks in advance