Screeling:
Here is a screenshot of my current hotbar setup. I just set this up tonight and so far it has given me a noticeable bump in overall DPS (specifically we are concerned with the four hotbars in the upper left to upper middle sector or quadrant or whatever).
The general goal here is to start from left to right on the top left hotbar with hotkey number two and just work your way across the hotbars, ending with "Alt 4"(Arrow Barrage). Then move down to the Second Hotbar from the top on the left side and work your way left to right again, ending at Ranger's Blade (the last, darkened out icon in the middle hotbar, second from top). Kind of like a snake winding down. Those four hotbars encompass all but I think one combat art (which is Thorny Trap).
You'll see some repeat abilities on there (like the middle top hotbar). That is because you want a backup instance of these hotkeys for when a lead-in ability (like Predator's Final Trick) is down. It's hard to describe here how best to use them, but you will just get a feel for the best timing. Just know that Coverage will still work when PFT is down, and the stealth CAs are up.
I am going to say "macro in /auto 2" with some of these, which you may already know about. This is to ensure that your Ranged Auto Attack is always on, even when using an ability that turns it off.
That all said . . .
Starting at the top left (from left to right):
Ranged Auto Attack (included on hotbar only as a guide to know when your ranged auto attack is currently on or off -- it should always be on), Intoxication (start here), Honed Reflexes, Killing Instinct, Focus Aim, Bloody Reminder (macro in /auto 2 with this one), Storm of Arrows, Stream of Arrows, Predator's Final Trick, Sniper Shot, Hidden Shot, Natural Selection
Top Middle (L to R):
Emberstrike, Ranger's Blade, Explosive Arrow, Arrow Barrage (end here and move down to next hotbar on far left), Rear Shot (this is a back up starter CA for when PFT is down, although you can work this into your rotation if you like), Coverage, Natural Selection, Sniper Shot, Evasive Maneuvers, Stalk, Evade (these last three are your de-aggros, and Evasive Maneuvers has a nice damage component to it, if you want to work it into your rotation -- macro in /auto 2 for these last three)
Second Hotbar Down on Left:
Snaring Shot, Searing Shot, Trick Shot, Point Blank Shot (macro in Poison Combination on top of Point Blank with this one), Triple Shot, Miracle Shot, Crippling Arrow, Hidden Shot (macro in Sneak Attack on top of Hidden for this one), Makeshift Arrow
Second Hotbar Down in Middle:
(Note: For all of these, macro in /auto 2) Hawk Attack, Sinister Strike, Lightning Strike, Sneak Attack (macro in Emberstrike underneath Sneak for this one), Hilt Strike, Immobilizing Lunge (I've considered re-positioning this to a place of more prominence, as this is a great debuff+damage for us -- in short this should always be on your target, especially if it's a longer fight/tougher opponent), Arrow Rip, Noxious Enfeeblement, Bladed Opening (most effective if used when target is 80% or more in health), Ranger's Blade (macro in Stalk above Ranger's on this one)
Third Hotbar Down on Left:
(NOTE: You do not need to work these abilities into your damage rotation, although you may use these form time to time during combat) Snipe (this is a debuff, and macro in /auto 2 with this), Stealth, Snare, Cheap Shot
Third Hotbar in Middle:
(These are all your maintained self buffs -- keep these on all the time) Primal Reflexes, Neurotoxic Coating, Pathfinding, Archer's Fury, Hunter's Instinct, Eagle's Talon (when you do your Enervated quest line, it gives you the Mythical epic bow effect as a self-maintained buff and resets your epic weapon to the Fabled version. This allows you to upgrade bows without having to lose the Mythical effect. BTW, if you need help with this quest, let me know -- you can start it at lvl 85.) Beloved of Bristlebane (This is my deity pet -- when you complete the Bristlebane quest line, which is easy as hell, you get this pet that is always up as long you have him casted that gives you a boost to AGI), Call to Guild Hall (if your guild has one), Escape.
As you can see, the remainder hotbars are just poisons, potions and various raid consumables, as well as some macros for specific encounter events.
Any questions, let me know.
EDIT: Also, a general bit of advice -- one of our AA abilities called Opening Volley increases damage to target as long as it is 80% or above in health. Note that I front-load my damage rotation for this reason