Faith GMB +3 skill ed base is better overall for pvm than a1 merc faith with wf by a huge amount, people just repeat the same false garbage "needing the 7 frame multishot nad need 99999 dollar gear, which is all false for pvm. The Maxroll guide for bowzon is a meme and completely false for pvm, they list legit BIS pvp gear, no one on ladder is going to buy 4x 40/15 jeweler armors and helm's just for 7frame multi, not even needed in pvm.
There is also the chaos zon that uses Upped Goldstrike arch or Brand GMB bow (insane +demon dmg and clears higher player chaos insanely fast. (670% Damage to Demons on one weapon with brand)
You do want a max rank lvl 15 fanta though (13/14 works), 10% for returned is undervalued, you basically get a mini necro armor meatshield with going with basic Faith GMB/Fort/Highlords/laying of hands, dual leech/ar ring/raven frost/Gores/giant skull with new guardian phys jool+15ias/stat/ed jool. Harmony bow on swap for the movement speed with vigor.
Also with the new renewed sunders you have even more -enemy phys res, much rather have an act 2 might merc with eth reaper's' toll, just so much more dmg on higher player counts.
I have all gears.
WF+Faith Merc = GMB Faith (BoS from Mania) + Might/Pride Merc.
Most bowzon builds perform about the same.
Walkzon for PvM is very old news. Nobody does that. Telebowa is the meta for pvm.
Walkzon has its ups for PvP in certain matchups but nothing to do with PvM.