Prism
Explorer
The main monster of the encounter usually ends up providing CA two or three times over anyway. Flanked, dazed, prone, squeezed...
Looking at your custom bard virtue I did notice that a fair few powers had some sort of slide or CA benefit to them but very few had raw bonus's to hit and damage. I'm not sure how many of these you have taken but if we look at the default virtues both have a fairly wide variety of effects. Since its seems that the party needs little healing and can cover its own ability the get CA I would say you would need to focus on boosting to hit, damage output and generating free attacks. Surely spells like Increasing the Tempo, Harmony of Two, Foolhardy Fighting for extra attacks for your companions or Satire of Evasion and Allied Rhythm for boosting to hit chances won't be wasted. Its a shame that none of your dex based powers (that I noticed) offered this sort of stuff. I reckon you could reduce those 7ish rounds of combat to 5 or even less
And of course you could always do stuff for yourself like Confusing Chorus