Something that helps me out on my Illy, especially when trying to keep the fury in my raid groups power up, are the mana procing items you can get. Those along with my myth buff and a few points more than most people put into the mana regen side of the Illy AA tree have really made a noticible difference in my abilities to keep power up. Also, especially knowing how my fury plays pretty well now, I know I usually need to hit mana flow to him about 15 seconds before I actually think he needs it. Also, I might add that using reuse red adorns as opposed to potency adorns on shoulders and forearms has helped out getting my abilites back up in time. As I get better gear and higher reuse I may switch those out, but thats been a better option for me at this time and something you might want to consider. My perspective is coming from a raid guild that's pretty casual. Raid twice a week. Most of us are decked out in t1/t2 gear. You could try some of the things I've done (mana gear, AA alterations, better preventative tactics) and see if it yields any better results for you.