Should i always use it (as in always toggle)?

WM as bard is fine because 1 skill give you 230 potency, another give you 100 potency and refresh your target debuff, and last one give you 260 outright, all of it is usefull.

Gauss round doesnt sound impressive (its basically clean shot skill with same damage) and ricochet only give 100 potency if you only have 1 target (i could be wrong in this one because there is no way level 60 skill is this underwhelming)

As for 30% extra damage, the auto attack should cover it up if you dont toggle the gauss barrel (again i could be wrong in this one)

Can anyone help? I want to enjoy machinist but so far... Its nothing impressive