What I meant by "stack" was basically overlap in buff timers. The guides I've read say oGCD --> GCD --> Repeat, but like in the example above, if you do IR --> WB --> HE --> VB, then you have both IR and HE up at the same time. What I've been doing is (again, for example), IR --> WB --> VB --> Heavy Shot or Straighter Shot procs until DoTs need to be refreshed --> HE --> WB --> VB --> repeat. I guess I run into the problem where buffs like Barrage sit on the side for a while, but if you burn all your cooldowns, don't you have downtime anyways?
Maybe it would help if I linked one of the references:
http://www.reddit.com/r/ffxiv/commen..._rotations_cd/