White Mage stance dancing is fun, especially when you get get good at it. It's what it was made for. Running low on mana is generally just a problem in lower content where people don't have the mana/hp pools like they do in end game stuff. Just be sure to use your Shroud of Saints before it becomes a problem. You can buy Ethers. They might not seem like much but they do help a lot. It's like having an Aetherflow for White Mage. Just don't ever blow your mp on dps when it's going to be needed for heals. Don't dig yourself in a hole because it's harder for a White Mage to dig themselves out of it.