I am a white mage and used to have that delay you are talking about back in November. A FC mate introduced me to a program called Battleping where it routes your IP through a server closer to the main SE network. Honestly, get that. It is 5$ for 30 days and it works tremendously. After DLing it, I don't die to lag in any fight, avoiding mechanics are a joke (except when RL extreme mode is going on playing under influences - gogo whiskey!) and it should fix that delay. Also, learn to hold down your right mouse button and strafe at all times as a healer. If you try to finish your cast then move you will die every time