If you want to roll with Phoenix, pair it with an Obsession. Easy 125 FCR, max res (85% FR with sorb, 80% LR). You can always swap it out for Spirit/Book to use LoH if doing high demon areas like Tz Chaos.
Either way the damage is going to be high enough with or without Phoenix, it’s simply shifting gear around to hit the 125 breakpoint and what you prefer. I wouldn’t roll one if I didn’t have one from my Zon because Spirit/Insight is so easily viable,