Seeing as you're a lv 30 ~ 31 WHM I believe I should probably tell you this.

WHM lv 30 - 34 is completely different from WHM lv 35 onward.
At lv 32 to 34 at Brayfox with -leveling/average gear- you would be struggling to heal as a WHM- mixing cure, cure II, and Stoning enemies when applicable. On big pulls, it would be very abnormal if you still had MP even if you managed your MP with cure for efficiency and cure II for immediate healing. I usually go from 1200 to 5600 MP by the end of a big pull, even using lucid and sometimes potions depending on tank gear and how well the tank plays with mitigations. This is at the same time maximizing damage output to speed up the fight. Cure II is expensive, and freecure being a trait only encourages this kind of playstyle at this level because mana is very difficult to manage for a WHM who has no oGCD healing. Brayfox is really a big checkpoint for White Mage especially to get accustomed to recognizing the speed at which incoming damage is being thrown out so you don't waste excessive mana.

HOWEVER --

This is because you don't have your strongest healing tool at your disposal at this point - the regen. Once you get regen at lv 35 + in an instance like Qarn - you will see a huge difference in how much you need to heal actively vs letting your regens heal the damage instead while you using Lucid Dreaming. In a big pull, I could use regen and sometimes throw a cure II or a cure while mostly DPSing because regen is effectively a weaker cure that's ticking for 15 - 18 seconds (200 potency per tick, which means 6 ticks = 1200 potency heal over time). Regen is also a 500 MP cost skill as opposed to Cure II for 1000 MP at 700 potency. From lv 35 onwards your healing tools only expand so it becomes much easier to heal after that.