Rotation question

[Malkieri]

0: BT
1.5: WW
3: Global cool down free
6: BT
7.5: Global cool down free
10.5: WW
12: BT
13.5: Global cool down free
15: Global cool down free
18: BT
19.5: WW

so maybe i'm a newb but i was just wondering what i should be doin on the unmarked numbers? should i be using a global cooldown at 4.5secs or just waiting it out to make sure i'm hitting BT/WW immediately?

[Fame]

well for starters you want to fit rampage and battle shout in there somewhere.
as for the rest of the downtime, hamstring works great for procs.

[Arrivan]

Demo. Shout fits nicely into one of your free GCDs every rotation if nobody else is doing it. It also means you have some small amount of utility to boot.

[Malkieri]

Right, i am going to be doing all of those things, demo/rampage/sunder if needed, but i am asking specifically about the gaps that aren't listed, like 4.5 seconds, 9 seconds, 16.5 seconds. should i be using a skill or waiting and making sure i pop BT as soon as it's available with no chance of missing?

[Arrivan]

I assume that's why the gaps are there. I didn't notice that to be honest.