Wrong. You should not stack vanish with dance. You want to maximize the amount of ambushes you get out and therefor you don't stack them outside of pull.
This is the code from the Rogue Mythic Simcraft profile.
Code:
actions+=/vanish,if=talent.shadow_focus.enabled&energy>=45&energy<=75&combo_points<4-talent.anticipation.enabled&buff.shadow_dance.down&buff.master_of_subtlety.down&debuff.find_weakness.down
Code:
actions+=/vanish,if=talent.subterfuge.enabled&energy>=100&combo_points<4-talent.anticipation.enabled&buff.shadow_dance.down
Code:
actions+=/shadow_dance,if=energy>=110&buff.stealth.down|(buff.bloodlust.up&(dot.hemorrhage.ticking|dot.garrote.ticking|dot.rupture.ticking))
The bold parts show that one of the requirements to use vanish or dance is that the other one is not up. You should also use both on CD and as such delaying them is a bad idea.
FoK is only worth it at 3 or more targets. Currently at 2 targets single target rotation + Rupture on the extra add is the best way to go, as the damage from Backstab outweighs the extra CP from FoK.
Code:
actions.generator+=/fan_of_knives,if=spell_targets.fan_of_knives>2
Previously it was >=2 but not it is >2.
Back to thread tho: He only uses 6 vanishes on a 5 min fight. He should be doing 2, possibly 3 more if he uses them of cooldown. I agree that his Hemo upptime is to high. Hemo is a net DPS loss if you use it instead of backstab. It is _only_ worth it on adds that die quickly and you can't get a rupture on them.
He is also sitting at to low energy levels. As sub you want to maintain a decent chunk of energy to be able to burst out damage during proccs and such. 50+ is my "lower" limit so that I can always dish out some quick spells when I have to. Your rogue sits most of the fight under 50 so he does not have a very good timeframe to react to changes.
Overall I think it is only small stuff that you get better at by trying. His simmed DPS and his actual DPS on manno is close enough to be good. Sub gains insanely from weapons so his bad daggers is his major bottleneck at the moment.