I am very pleased with HoW. PoE particularly. I slowed down and refused the grind during dark below, I am now a shiny 33, 33, and 32. All without grinding out radiant shards and armor materials.
Now, onto Petra.
I suggest keeping all bounties on a particular planet for that week. This will foster grouping of players on similar gameplay goals. 2 v the Wolves is not 30 seconds of fun, but 5 minutes of pain before the Wolves grow weary.
This will work synergistically with your patrol matchmaking system and will serve to keep your worlds populated for the guardians pushing through on strikes and story.
Thank you for your time.