Lightning spear with Sacred Flame advice please.

I’m running Crouching Tunas lightning spear build from Maxroll, the 180 spirit+ version and it’s a cold converted build. I just got a sacred flame last night that’s 60 percent fire dmg, so as far as I know I do cold lightning and fire damage and with the extra 100 spirit I decided to try using Trinity.. Is that the best choice for me? I mean if I have extra spirit I’m gonna use it. Can you please take a look at my build guide and tell me what you think?

Also side note people tell me I shouldn’t use call of the brotherhood but I was told I need it for my build as it is to work so tell me what you know about that.

https://maxroll.gg/poe2/build-guides/lightning-spear-amazon