Keep in mind StormBlood is dropping in 2 weeks, so the DPS skill listed here will be outdated.

Currently you'll want to keep Aero 3 and Aero 2 on a boss, and use Stone III once you have both up, if you have to move to avoid AoEs and stuff, you can use Aero I as well as it is instant cast.

Regarding your macro question, I highly suggest the below macro:
/ac "Stone III" <f>
/ac "Stone III" <t>
/ac "Stone III" <tt>
Do you know about the focus target function? I'm not entirely sure how to focus target on a controller, I just know it's possible.

The above macro will 1st try to attack your focus target, if invalid, will try for your target, and then lastly for your target's target.

So my suggestion is always focus target the boss/mobs you wanna kill, then you can just switch your main target back to your tank, and freely dps.

Hope this helps!!