I saw this build and skimmed over it, and didn’t have the chance until now to read it over. Sadly, conversions that are baked into area-wide buffs like Blood of Dreeg don’t actually work with pets. The reasoning is that pets are considered “allies” for the sake of wide radius buffs, and these buffs having conversion in them ultimately gimped the multiplayer experience by converting all the other players’ skills into a non-useful type.
Since that’s the case, you can switch the amulet to the Chaos RR Conduit that I use and it will be roughly a straight upgrade. You don’t have any real sources of Acid and Poison with the exception of the flat Acid from Blood of Dreeg which would be used on Oblivion; if it doesn’t explicitly say “bonus to all pets” for a conversion, your Blight Fiend’s Acid damage will remain Acid.
Honestly, that makes your feats even more impressive.