Outdated. The new changes from 2.1 has made things a lot simpler. Fracture is now worthless and a loss of dps to use at any time with the higher potency of several of our moves.
Heavy Thrust > Impulse Drive > Disembowel > Chaos Thrust > Phlebotomize > True Thrust > Vorpal Thrust > Full Thrust > Heavy Thrust > True Thrust > Vorpal Thrust > Full Thrust
Or to put it simply ;
H > IDC > P > TTT > H > TTT
P > IDC > H > TTT > H > TTT
This is currently the highest dps combo for sustained dps on large targets, the Chaos Thrust combo, then 2 of the Full Thrust Combos with alternating Heavy or Phleb between them. Comes out so that for the first Chaos Thrust combo has Heavy before it and the next has Phleb and so on. I of course am leaving out instant skill usage. You will want to weave them between hits and start after the first Heavy for maximum up time. You start off with the self buffs like Internal Release after Heavy and Blood for Blood after Impulse Drive, and then move onto the attacking cooldowns like Leg Sweep/Power Surge/Jump. Still be mindful of when to use Jumps since it still has an animation lock even if smaller. Spineshatter and Dragonfire are used as movement skills primarily and can be worked into spots you decide you need an extra hit or aoe move in fights where you don't believe you will need to quickly advance to targets.
Can also just go with the simple combo from before 2.1 as well of;
HP > IDC > TTT
HP > TTT > TTT
Over and over. Really easy to remember and work out instant skill usage since because of timings you will always be able to use certain instant skills after certain parts of combos, like Leg sweeps cooldown makes it s oyou can always use it after the first True Thrust of the first line and the second True Thrust of the second line. Same with Jump being able to come after every like Chaos Thrust with Power Surge after every other Disembowel iirc.
Really I just wanted to provide basic information, and if you want in depth stuff and reasoning and testing results go to;
http://forum.square-enix.com/ffxiv/threads/79042-Dragoons-A-Rotation-Reborn
I believe the op is updated with 2.1 information. First ton of pages will of course be referring to old stuff so will need to skip to the end and go backwards to see what testing influenced what choices. Also provides stat weights and BIS gear lists. Enjoy.
You shouldn't use more then one instant skill between combo hits. Even and especially Power Surge and Jump. It will clip your moves and make skill speed have less value. Also Heavy always comes first in every conceivable situation.