Mantra.

4+n/4+r CttC. Means once snd is running you refresh it by performing 4 or 5 CP envenoms while keeping rupture up. HfB every 30 secs, it's a huge DPS boost. 
Priorities: 
1) Keep HfB and SnD up 100% 
2) maximize rupture uptime 
3) envenom as much as possible without violating rules 1 and 2