I've recently picked up mage classes, and yesterday I played Conjurer in a 4-people party with my linkshell. Yes Curaga II pulls a lot of hate, so I avoid using at at all cost. I think, however, it's still manageable. I always used Soughspeak before using Curaga II if I MUST use Curaga. I just take care not to buff/heal people before tank ensure that they have enmity on all of the mobs including the link/add/aggro ones.

Playing mage is not easy, especially for me because I am a melee kind of player. But I did find out that Stoneskin and Shock Spikes help a great deal! Stoneskin helps a great deal and I stick to using Sacrifice II from THM, while spamming Stoneskin AoE on all melee. Sometimes I still had to throw in Cure II, though. And yeah during downtime either due to pulling distance or mob's spawn delay, I would use Spiritsong and spam all kinds of healing magic including Curaga II if everyone need a big chunk of HP. I am a scared mage, so I tried to play safe that way.