Vitality potion probably won't help since its just a boost to def and not a straight out dmg reduction like sent/Sang.
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I will not disagree the WS is strong, but bard songs and support increase the whole teams damage, which is more than damage the bard throwing a few extra WS.
I've tried the potions and they will give you a noticeable increase, but currently the MW prices for them is still unreasonably high to use them on a regular basis. (at least on my server)