Steady Aim is multiplicative with glass mole so its really strong in that regards, also gives +100 attack to your skills.
Barrage give you a total of 15 extra hits for spike damage, doubles to 30 if there’s another rogue in the party
There’s a reason why all the current world bossers run A2 R1 Scout1 as opposed to A3 Scout1, its too laggy to use Multishot 15 in a world boss environment. The damage gained from +10% and +100 damage on your magic arrow as well as the extra instant-burst from Barrage are all much better than what A3 offers you.