Non-level 60:

Single target: only flare when you have convert and swiftcast up, usually in your opener and when RS is off cd.

2 targets: Fire 1 spam then finish off w/ a flare > transpose > F3 > repeat. If convert is up then flare > convert > flare.

3+ targets: Fire 2 spam then flare > transpose > F3 > repeat.

Level 60:

Only flare on 3+ targets or if you are using the sharp F1 opener and don't get a F3 proc on your second F1.