How to use the Witch's Hut effectively? + Late-game Pyro Qs

Hello,

I'm going with a pyro mage this run, and was wondering about cursed items, since ideally I won't get hit and it'd be fun to be a full on glass Jonna.

I know the witch will curse all your non-enchanted items that you have equipped. Wanted to know how others utilize this tho.

Do you save up and buy the standard gear you wanna use for the rest of the run, then go and roll curses on them? Or is there another option?

Side question: between the Necro staff and Witch staff, which one would you go for? Or does a pyro prefer to use another staff altogether?

Side question 2: What would a pyromancer wear in the endgame. There's a bunch of mage gear and it's hard to decide. Is going full miracle chance a viable option? With my seals, I can reach 50%-ish miracle chance, and that's without enchantments.

Thank you in advance.