? Its not getting rid of any damage I can maybe see being given 2 empyreal arrow charges but theres no need for more blood letter procs. you hit empyreal arrow and combo it directly into bloodletter not sure how your losing DPS... Mages ballad you literally just rotate between burst shot and blood letter and 9/10 times it will proc the times it does not proc you pop empyreal arrow because its usually up and continue the rotation. The only reason I can maybe see giving 2 charges to empyreal arrow is so you have more to do in the weakest song however I would rather that song get a nice rework and have a purpose rather then cutting that song short to go back into Wanders.
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your not pissing away any damage when empyreal has a higher potency and your combining it with bloodletter so your getting a higher total damage output. Its very rare that your mages ballad will not proc a blood letter after burst shot but when it does again you have other abilities you can be using to fill in the gap.