The moment you mentioned A3, I just lost it. I have no love for Archer 2/3, except for the lovely Mutli-Shot. Right. Back on topic.
Is that +2 level really that good? Has anyone confirmed that the +2 level is better than having a good xbow before the switch to DGC? If it is, a QS/Wugu can switch to a 2h when using Wugu skills then switching back to xbow, especially since they fixed the part where your poison dmg follows your current wep, instead of initial wep.
Also, Wugu’s skills are highly situational. After 170, there’s just not that much chance to use AoE skills until Alemeth/Evac since a lot of the mobs will either be too far apart to make it worth or flying. The poison skills would be mainly for bossing and tanky mobs.
If you feel that Ar2 is essential to a QS build, then going Ar2/QS3/Wugu2 would solve all your issues with the QS3/Wugu3 build. You don’t really have to go Wugu3 unless you’re a hardcore poison lover.