I've been procrastinating switching from my patched together arena/dungeon heroes to a dedicated clan boss team. I only do 12 to 14 million per key on NM auto. I have t6 masteries on all but no lifesteal gear. Going to switch to CA. Someone said leech has been buffed, and is good for CB. I also heard stalwart gear may be better. 

Using apo, brawler, coffinsmasher, jarl, zelotah gets me to 27-30 rounds now

1. Replace apo with skullcrusher 

2. Lifesteal or stalwart gear

3. I think corpse collector is only leech I have

4. Replace someone with sepulcher sentkarl?

5. Speed tune? 

Result: sepulcher, corpse, brawler, coffin, jarl?