iirc most of our dps AAs are related to 2H - increase of double attacks is one of those AAs - i.e. boost of double/tripple attacks by AAs will level the faster swings of 1H in comparisson to 2H.
I can't show parses as evidence - but I often camped undeads in arcstone and nowadays have camped the undeads in direwind - if I use BoFF+Shield compared to epic 2.0 auged dmg+5 I end up killing more mobs in same time using epic 2.0 - my assumption is - the non-slay dps of epic 2.0 is much higher than BoFF and the 3-5% more slays I will get with BoFF wont cope that. In addition slays of epic 2.0 quite often are 10k+ whereas slays from BoFF tend to be 5-10k
Next time I camp undeads in direwind I will log hits and fight 20 mobs with epic and 20 with BoFF - small sample but better than nothing.