Damn, I'm so impressed with the improvement since last time xD Very very nice man.
Non-rotation wise, try to replace that Chrono ASAP.
https://puu.sh/vm50E/9a450ef3d0.png that's from the icyveins guide, and a list of better trinkets. Aim for better for sure. Shouldn't be too hard to improve on it.
If you can, try to aim for CoS/Arcway 2pc at a high enough ilvl to be an upgrade, (Sim them) but you have good alternatives so it isn't a huge drama.
The necklace you're wearing, isn't really worth it, an 890 Mast>Crit would be better, possibly even Crit>Mast because your crit seems a bit low (Not totally sure, can't see your armory for some reason)
Logs time!
Trilliax: Quite a bit of focus lost, during his beam you can still throw casts off, position yourself well and make sure you still get the last aimed shot of each vulnerable (Don't die doing this :P) If you get the gloves you can continue your rotation as normal during beam (Cheetah is good here to keep you safe if you don't have gloves). Your patient sniper was still a bit off, only 7 of your 23 vulnerable, had an aimed shot hit in the last 2seconds. That needs to be 23/23. You did vnice dmg considering though. (Make sure you run crows on this fight)
Aluriel: I'm not great at reading aoe logs, but just make sure you trueshot on pull, and then save for each add phase. Do normal ST rotation until first adds, then trueshot, multi+marked spam till you're close to 20 stacks (Don't overflow stacks) cast an aimed shot then repeat.
Tich: Nothing to say :P Good work. Just get the most out of your belt here.
Augur: Just really need to keep working on patient sniper, you did much better here than earlier, 16/37 aimed shots, but 12 of the vulnerables you just didn't cast an aimed shot, in high movement are you reverting to arcane-marked spam? Try to work around the movement and predict it, if timed perfectly with the fel debuff you can still cast an aimed shot between the drops on the ground. Debuff isn't applied instantly. But again that's tricky, you may just prefer to play it safe.
Botanist: Make sure you have trueshot when the boss hits 50%, prolonged with that (Hopefully your team lusts there) and enjoy your op belt :P It's so good there. And before that, just make sure your doing patient sniper right.
Elisande: Just patient sniper!
Huge improvement so far. Just keep working on Patient sniper and you'll be all oranges soon enough :P