Try opening with Cover Fire then Mortal Reminder - the Defence debuff means everything that follows ought to connect, plus the DoT gets ticking iover early on for extra DPS. If you've got the poison DoT in your AA setup, stick that on too when you open, as that does some good numbers. All fights, keep MR going - as you can tell from your pie chart, whilst it's not massive, it does provide a reasonable chunk of DPS.
Longblade --> Rangers Blade is something that gets overlooked now and then... But by my calculations it's one of our highest DPS combos, because we can get it off so quickly. If you're in the sweet spot you can get that pair off without missing an auto attack. Does require some nifty finger work though to switch between melee and ranged arts smoothly.
Tarinax's bow (and the one from A Drake) are good as ammo providers, but really no great shakes on the actual DPS front. Ideally you'll want one of the following:
1. Ancestral Sarnak Warbow from Venekor: technically the easiest to obtain, since he's cake to kill, but an incredibly rare drop from his loot table. Only had 1 drop for my guild in a year.
2. Longbow of Corruption: Drops off Matron in Fallen Dynasty. You'll probably find the main HC raid guild on your server has her on lockdown though.
3. Star Darkened Longbow: From instanced Mayong, MMIS.
4. Rigid Scale Bow: Crafted recipe from Wuoshi, EH. Enough said. You need to be able to clear Emerald Halls to get this.