I have a suggestion for your macro section. I have found it very helpful to create macros for all my enemy targeting abilities (attacks, virus, bane, etc) to do target or target's target. That way, you can keep the tank targeted and have your attacks hit whoever he is hitting without having to switch targets, and you can also target enemies normally. It's a great setup for beginners.

Example:
/macroicon "Ruin"
/ac "Ruin" <t>
/ac "Ruin" <tt>

Unfortunately, similar macros do not work as intended for healing. If you are on console like me, you gotta target your healing the old fashioned way. For PC, there are mouse over macros that sound very useful.