Is it more beneficial for the bard to stay in Wanderer's Minuet (+30% Dmg, No Auto Attacks) rather than play Foe's Requiem for one single caster DPS? Has anyone parsed this yet?

It's really hard to figure this out with such vague tooltips. I literally cannot figure out which is better without some serious number crunching. Can Foe's just be changed to give +10% Damage to damage from spells and simplify it? People have a hard enough time learning rotations correctly.. why add this and complicate it even more?