So one of the things you can do to increase DPS is to put a Ruin 2 before every OGCD ability and weave at least 2 inbetween each Ruin 2
So your rotation would look like this
Ruin2 -> Raging Strikes -> Dreadwyrm -> Ruin 2 -> Tri-Disaster -> Contagion -> Ruin 3 spam ->Ruin 2 -> Deathflare
The other thing is if this is your opener you will have three stacks of aetherflow going in and ideally want to throw a fester in during the dreadwyrm trance.
My opener looks like this atm
Put shadowflare on the ground slightly in front of the boss just before pull
Bio 2 -> Miasma -> Bio -> Fester -> Rouse -> Spur (sometimes it's possible to get three abilities off in between but not always) -> Ruin 2 -> Enkindle -> Ruin 3 or Ruin depending on length of fight -> Shadowflare -> Ruin 2 -> Raging Strikes -> Fester -> Ruin 2 -> Painflare -> Aethrflow -> Ruin 2 -> Dreadwyrm -> Tri-Disaster -> Ruin 3 until 5 seconds remain on dreadwyrm -> Ruin 2 -> Swift Cast -> Fester -> Ruin 3 -> Deathflare.