Fire, in general, can follow the mantra ilvl over everything, except for items with crit on them. In general, you want to avoid crit as a stat wherever possible, but be sure to sim any ilvl upgrades you may get.
The tier set for fire, while a decent DPS gain is very underwhelming in terms of function. You can basically ignore the fact that it exists.
I recommend crafting the following 4 items for Fire embellishment, assuming you kept up with the spark quest:
- Amice of the Blue
- Intellect Dagger with Potion increase by 50% Embellishment
- Ring/Belt increase feast duration by 100% and persist through death (increase feast duration by 100% and persist through death)
- azurewave 2 set 2p set. It is a stacking intellect buff with a very big uptime. Unfortunately, it counts as 2 embellishment to complete the set
For trinkets i would recommend trying to chase the following:
1st Ragefeather from Nokkud.
2nd Whispering Incarnate Icon from Primal Council in the raid.
3rd Chillglobe from Primal Council (this trinket is a healer trinket but its very good for fire because it lines up with Combustion, 1 Minute)
4th Horn of Valor from Halls of Valor.