Originally Posted by
Zatetic
A large portion of your damage is your mage bomb. Make sure to track your trinket procs and what not and refresh accordingly.
Try to refresh it when needed on 4 stacks.
Refresh it if your trinkets proc and its on 50% or less.
With regards to the above post, During your Alter Time, you always want to barrage to clear stacks before AT wears off. 4 stack barrage hits much harder than an AM proc.
Outside of that though, AM has an extremely high dpet. If my NT needs refreshing, I'll always use one or both my AM procs before refreshing it (or applying it to other targets) just to chance a third/fourth proc while I'm at 4 stacks.