I would say 4200 more damage a minute to be pretty sizable and some people are hitting +100 on their dps which is 6000 more damage in a minute, anyway I remember back in final coil with my static our bard pretty much stuck to one set area and only moved for mechanics, I think that kind of thing is where you WM and then you pop it off for mechanics to continue dps until your 15 second recast is up.
Bard + MCH should still be one of the classes with the most dps uptime its just a bit more complicated now.