When to use Straighter Shot Procs was actually what got me so interested in BRD skill mechanics for 3.0.

Keep in mind while you are gearing that Skill Speed increases the # of Heavy Shots you will do on single target in between re-applying your Dots. Skill Speed also decreases the recast on Empyreal Arrow.

Increased # of HS = higher probability of SS Procs + Reduced EA Recast = More EA weaving for free GCD's (dat TP though)