You should also change your yellow gem in your shoulder from pure haste to int+haste, as well as get the leg enchant that gives int+spirit instead of int+crit (it's called Greater Pearlescent spellthread).
You are also under hit cap by 160 rating (you need 15% which is 5100 rating), so that needs to get fixed asap. The best addon ever for this is called ReforgeLite. It actually optimizes and does your reforge FOR you in-game, almost like a bot. You go the the NPC and hit the reforge button and it automatically reforges all your gear. It is amazing, get it now.
As for playstyle, you should completely forget about using symbiosis Tranquility. It does absolutely pathetic healing (300k), which is 8 seconds where you aren't doing anything. Even spamming Binding heal is higher HPS. If your raid leader or healers tells you to use it, tell them it is complete garbage and that it's simply not worth using. Spamming flash heal / binding heal is time better spent if you absolutely are required to offheal.
Now, change your PW:S glyph for glyph of VE to get a stronger raid cooldown, and use that in instead of tranq.
Hymn of hope should only be used if your healers are really mana starved and practically begging for it, because using it kills your damage.
I quickly glanced over your logs and you seem to be using cascade on blade lord. Cascade is only good for fights where there are a few adds spread out that it can jump to (elegon and twin emperor for example), so you should definitely use Halo on that fight.
It's hard to gauge your dot uptimes on that fight, because he frequently vanishes and you have to reapply. But if you don't have an addon that tells you when to recast your dots after the penultimate tick, so it lands right before the debuff expires, you should consider getting it. ForteXorcist among others can do this.
I didn't have time to look more closely at your logs (just skimmed), but perhaps some other helpful soul could take a look at your mindblast casts, because I am sure that has a large part to do in your subpar single target damage.
Also, when you get Unseen strikes on you, you should run out of the raid away from everyone and disperse the slash solo. Saves your healers some stress.