In one of those videos he uses the skill twice without having to refresh the arrows stuck on the mobs. Let me find which one.
He uses the skill twice after using the last barrage. With barrage it becomes even easier to reach the arrow count. Completely forgot about it.
kabbalist cant summon golems
Let me rephrase for you 
Kabbalists outside of TOS are known for their golems. IMC should’ve at least given TOS’s Kabbalists the ability to summon or create golems.
That will probably be the highlight of Kabbalist C3. Just like alchemist and their homunculus, they only get at C3.
idk about that, we already know nachach is c3 kabbalist idk if they are gonna add anymore for c3
rank 8 smoke bomb and cannon shot does 125k damanger for a cannoneer. So yeah they are not that weak.