Rogues should have 100% uptime on this fight.
- You can stand at max melee range with Feint up for Rupture Realities.
- You should stand still with Feint up for Unbound Chaos.
- You should put Shadow Blades in the far left or right corners in melee range.
- You should solo Dark Mark in melee range with either CoS or Feint + Crimson Vial DR (pop it as soon as you get Mark to stack it up) + ShS (to negate the knockup).
As far as Rupture uptime itself, you should plan around when Cleansing Protocol is coming and put your DoTs up on Maiden a few seconds early so you can just dump Envenoms into her during the shield with your DoTs already ticking. Keeping it rolling on Avatar during this time is not super important, but you can try to refresh your DoTs on him as well just before Cleansing Protocol is coming.