Haven't seen a thread for this and I think it could be helpful to discuss the HFC encounters with fellow boomkins to maximize performance.
Tonight before realm shutdown we cleared up to Heroic Gorefiend. Got him to around 30% or so.
Anyways, for Hellfire Assault (first 'boss') I attempted BoP with Incarn but didn't really find it too be very good compared to Euro which our other boomy used. Pretty straight forward fight and very easy.
Fel Reaver - was also pretty straight forward, used Euro and Incarn. Used Feline Swiftness as well and I think is overall better than Displacer Beast for it.
Kromok - I used the same setup, hands wern't really up for long in our kill because our DPS melted them so I barely got any Starfall hits. Feline swiftness is also probably more suited for Kromok rather than Displacer Beast.
High Council - Used Euro rather than BoP, which I think worked out well, despite being a council fight. Although if other boomy's found BoP to preform better than Euro feel free to comment why. Displacer Beast has it's moment in this fight to run out the runes when you drop them off at the outer edge of the room.
Kilrogg Dreadeye - Same setup, and I used Displacer Beast to run out the dagger / axe ability which drops the slimes that fixate towards the boss. Straight forward.
Obviously heroic is pretty much a joke for most guilds in mythic BRF gear, but I think it's worth discussing any tips or advice for the encounters on Heroic so far, at least until Mythic is released and things get more interesting. Hope to hear from other boomkins about their suggestions on the fights.