Maybe a cloak that's geared more towards melee skills vs. a heal proc. If you can get the dps clicky cloak, you can make a macro to click it and swap back into a zek or something else on the pull.
You've got good earrings/rings, maybe the torque neck out of Vaults. I'd probably lose the leviathan charm for the gorowyn charm (start quests on butcheblock docks from selnok guy) - arbitor tossed for nathser or carotidcutter if you can get them. BP for something with crits - but ymmv.
I'm not sure I like the assassin's thirst proc - if you're on a raid with other melee classes, it cuts down on your chance to strike a death blow - that seems better for solo'ing when you could swap in something else for raids. When you get a good neck get the 10dps adorn on it.
Ummmm I'd probably lose the bow for a better ranged pouch - skyfire pouch of storms I think (could have wrong one) has 51str + 30+ sta or agi - one of those. ;) You get your ranged weapon CA back.
AA wise I'd lose the STA line for raiding (edit - if you die a lot and think you need it...stop that! ;D) and throw the extra points in relevant AA's in str or agi & keep boot dagger.
Timing and CA's - if you're timing CA's vs. spamming them, you shouldn't run out - something should always be coming back up. I don't seem to have trouble there but hell I may be fuzzy in the head. Well I AM fuzzy in the head, but that's beside the point.
If that doesn't work, you might try just autoattacking during CoB then back to CA's again when it's up - see if that helps, then start adding in a couple CA's during CoB till you can get a steady pattern going with it and not get stuck waiting on timers.
Don't forget to use your temporary haste/dps buffs every time they're up.
Just my .02.