Went through similar pains. 5 hours in and we disconnected the first time. Second time our building lost power. Third time we failed miserably trying to bubble and rocket him. But, we finally won.
It's nearly 3am here and I'm on my phone but I'll try to summarize. Basically one stun-locks and the others rocket. More details:
- All three of us were level 34s (two Titans and one Warlock). Everyone with max rockets because Crota boots.
- Two people (A and B) with Ballerhorns and one (C) with Babyhorn (Hunger of Crota) and Ice Breaker.
- Go the left strat as always. A and B down the Servitor and unload their Ballerhorns.
- As Servitor is going down, C pops their bubble and slowly Ice Breakers him to keep him stun-locked for the longest time possible. This keeps him in place for max rocket damage from A and B. One headshot every two seconds or so. Be sure to re-up on the WoL.
- A and B re-up on rockets with synths, and then unload those.
- When C runs out of Ice Breaker ammo, burn those rockets.
- Profit!
All that should down him before mines start and before devouring essence hits. We had ~20s left on the first mine when we downed him.
Numbers wise my Hunger, with WoL, was doing ~10k. Ice Breaker was crit-ing for ~9k. Comparable enough I think.