We don't use anyone with imp demo shout. IMO it's not a big deal unless you're in a hardcore guild and your current progression is way ahead of your gear level. If you do get it, consider only getting 2/5.Also, should I consider speccing into improved demoralizing shout over 5/5 unbridled wrath? Just how much rage and dps do I expect to lose by dropping points from unbridled wrath? How much utility do I add to a 25man raid by taking improved demo shout?
Proc based enchants will see more procs from your mainhand because you swing with your mainhand when you use skills like Bloodthirst and Heroic Strike. Consider that your offhand is only hitting with white damage and Whirlwind. Your mainhand is hitting with some white damage, some Heroic Strikes, and Bloodthirst. The kicker is that Heroic Strike only has the 9% miss rate of special attacks, so will land a lot more than your offhand autoattacks.Finally, do enchants like mongoose and executioner proc more often on a mainhand weapon? If so, which enchant takes MH precedence? Considering the expense of those enchants, can I do potency until tier2 of my Drakefist Hammer weapons, then mongoose, then executioner? Which adds more dps?
IMO I would put Executioner on your mainhand. Your offhand enchant could be either Mongoose or Potency. I prefer Potency because I don't have a lot of haste so 2% more on a proc doesn't matter much, and I have a lot of crit so the 4% more isn't as big of a deal as 40 constant AP in my mind. Both are fine for your offhand though.
I had Potency on both my weapons until I got 90+ dps weapons. Using better enchants before that just seems like a waste.