Thank you for this. I want to emphasize the "PLEASE DO NOT USE TOPAZ CARBUNCLES" part. Seriously, they completely mess up my tanking because I can never seem to divert the mob back to me to manage the group properly. It messes up enmity so that when someone starts using AoEs the mob that's attacking the carbuncle strays towards the party which makes me have to bring the entire group of mobs toward them to retrieve it. :/ Cue more AoEs and the fact that I now have to spam Flash decreasing my MP, and as a result I have to use Riot Blade to get it back, screwing up the enmity of the mob group entirely, which creates a huge mess.
This is just the experience I've had with Topaz Carbuncles and dungeons so far as a tank.