Testing Sub now.
Cooldowns and Vanish is messed up, like you said.
When Subterforge buff is on, spam Ambush as combo point builder.
I cap anticipation alot! You should set it so we never do that, like Eviscerate at 2+(?) anticipation stacks or whatever.
When Shadow Dance is up, spam Ambush. Please add Shadow Dance to be used alongside with cooldowns instead of in rotation like it is right now. Would be realy good to have that timed with Synapse Springs etc.
"Apply and maintain Rupture with 5 Combo Points. If Garrote or Crimson Tempest is applied on the target, there is no need to apply Rupture (thanks to Sanguinary Vein Icon Sanguinary Vein)." = Use Crimson Tempest for the AoE rotation. Right now its only saving up points for Eviscerate.
Thats the things I can think of after some testing
EDIT: Also, please add support for the "replace Backstab with Ambush" bonus from the previous reply I did
EDIT2: Without cooldowns, im doing about the same dps as I do with Assassin spec (ilvl 553 ~180kdps, unbuffed on dummy), with the changes I posted it should be about 10k higher.