There certainly are viable choices but I wouldn’t say they’re optimal at this point since you’ve already gotten archer2.
Sapper2 is great for aoe but I’ve heard Broom Trap falls off in damage late game.
Wugushi2 certainly is viable and I would’ve suggested to go A1QS3Wu2Cannoneer/Musketeer. But then again you’ve already went A2 so that isn’t possible anymore. Wugushi’s damage is great both in single target and aoe although better for solo and small party play as poison overwrites each other if there’s another wugushi. WugonGu synergizes well with the quick autos from running shot spreading the infection.
Falc1 is all you really need for circling. Let’s say you have +5 aoe attack ratio (manamana, vubbe fighter gloves, 2x gladiator band). When you use a skill like multi shot which has an innate 0 aoe attack ratio, multi shot becomes +5 aoe attack. Therefore the old multi shot that hits one monster can now hit up to a sum of 5 aoe def ratio. By size small = 1 aoe defense, medium = 2 aoe defense, large = 3 aoe def etc. That means +5 aoe attack ratio multi shot can any combination of monsters of sum 5. Of course you can hit 2 large monsters to bypass that 5 but the game prioritizes large monsters first in the formula so you can’t hit 4 small + 1 large but rather 1 large + 2 small.
Now why circling is so good is it reduces all the monsters inside the aoe’s defense to 0. So considering how aoe attack ratio and aoe defense ratio works, you can basically hit everything that’s inside circling.
Fletcher3 is because of magic arrow hitting 25 times over time on a single cast. With Fletcher2 you’re only getting 15 hits from a Lv5 magic arrow and a weaker crossfire as compared to going full Fletcher3.
There’s one other viable build you didn’t mention that is Schwarzer Reiter 2 which is something like this.