I dunno, I feel as if provoke is fine as it is.
I'll usually use it if I lose aggro on something and wait until I have RoH combo'd 2/3rds done to regain a fair amount of emnity or if I know I can get back with Shield Lob. It's also great if you suddenly get k.o'd while tanking in a pug and end up dying due to someone not healing you, or just having messy coordination, since it'll put you right back at the top with +1 emnity.