if you feel as if you really need to emphasize damage on a particular hand then deathflare is probably the most aoe you should do. you can also reposition shadowflare to only hit one hand (this would require you to either clip or leave it down for like 10-15 seconds though). back when i got really desperate during progression i spent a third af stack on energy drain, but i've started using that on bane after equal concentration finishes instead