Ranger c3 skills are mediocre AOE wise. Barrage is what you want, and the base damage diference will be less effective as you level up and get better gear. Barrage lvl 5 is enough. Ranger c2 is whack as well.
Sapper asks for circle 2. Never go circle 1. Always 2. Although 3 doesnt offer anything in the OMG tier for pve, 10/10 broom trap is good, but lvl 5 BT is enough. Stake stockades is good as well.
If you are going for wugushi c3, for the sake of it, make sure you are not doing this for Jincan Gu. The skill isnt bad, but it isnt something as well. There are some KR videos showing how it isnt that great at all. Wugushi 3 is for more levels in Wugong Gu, Throw Gu pot, Needle Blow, and Zendhu (the leftover points ofc). Wugong Gu and Needle Blow tick for base damage +100% physical damage, and get more ticks as you level them up, so they are a must to max.
AOE damage against flying targets: Zendhu your party, wugong gu, barrage. Spread the poison, now go spam oblique for the rest of your life. Use viper. Even eles have problems AOEing flying monsters anyways. Get some traps inside the mobbage, use detonate traps with the flying mob dmg atribute.
Going cannoneer instead of wugushi 3 offers more AOE burst, less single target. Going wugushi 3 offers more Single target, less AOE DPS. keep in mind not critting in cannoneer skills is like splitting the chocolate on the floor.
Pay attention here, you came all your way with: Ranger Sapper c2, wugushi c2. If you noticed it, all the skills you use scale better with str, (barrage, broom trap, poisons). Cannoneer urges for critical hits! Only barrage and BT can crit, but they scale well with both full str or DEX>str builds as well! But you have poisons and they cant crit…
You know you can have decent crit rate even going full str via min-maxing and archer c2 instead of ranger c1. (but you could be using those weapon sockets and sub weapon sockets for physical attack and max attack, but oh you gotta choose at some moment o.O)