This week its safe to use exactly what wiki says to farm the Am Fah.....which is
"Leave from the The Marketplace or Nahpui Quarter and farm the Am Fah along the eastern corridor of Wajjun Bazaar."
They are in mixed groups so SoS solo is likely a bad idea

however...

If that doesnt work for u (like it didnt work for my 2nd account), because, for instance u have, and plan to keep (for a later VQ of the area or the 2 Zaishen Bounties there) the Seek Out Brother Tosai quest, which makes the Am Fah in the area of Wajjun Bazaar non-hostile to u.....u can just go into The Undercity from Wajjun Bazaar and u will find groups that are hostile to u
As an added bonus u CAN use the SoS solo build there with no more than the normal tactics u would generally use with that build. I used;
>Painful Bond
>Vampirism
>Blood Song (always use this if its a choice between it and Pain, since it is a self-heal spirit)
>Signet of Spirits (duh, lol)
>Shadow Song (the Assassins and Rangers cant hit what they cant see)
>Armor of Unfeeling (necessary as with any SoS solo farm vs anything above level 10)
> Mend Body and Soul (u will encounter several degen conditions here, including some from traps by the Rangers.... poison, bleeding, crippling, and yes, even burning from the traps all of which can put a major dick in ur day)
>Summon Spirits (using ur highest Luxon or Kurzick rank if u have the skill from both factions )

The groups here are still mixed, however it is easy to avoid over aggro'ing them and it is usually just a group of 4, usually with a monk
(which isnt an issue because ur spirits target him 1st (so cast ur Painful Bond on him)...why, because... SPIRITS ATTACK LIKE JUST LIKE THE ENEMY AI DOES, meaning they attack foes with the lowest armor rating 1st or the lowest health....which explains why they ignore ur Koss, unless he engages them 1st, and try to get at ur Ogden)

btw....just stay away from the elemental boss...he is an air spiker and will definitely kill u if u fuck with him and his group...definitely kill u multiple times
Other than that, if u clear ALL of the Am Fah in this area of The Undercity it will take u about 1-1.5 (2 at most) runs (which can take any where from 20-30 minutes each) to get the 15 Idols that u need for the Traveler

gl/hf
Atty