Originally Posted by erragal
IS with just the glyph (Not even including 2-T7) is better DPCT than Starfire at any current gear levels. Moonfire is nearly 50% more DPCT than Starfire if you're using Starfire + Moonfire glyphs. Even if Starfire(Eclipse) put you at 100% crit rate you'd still be losing DPS by not reapplying moonfire during it. The only time you would not reapply moonfire is if you know it won't tick the full 24/27 seconds.
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The real answer is that it makes sense to refresh DoTs if they fall of early during Eclipse, but if they fall of late in Eclipse you should cast one more nuke.
Suppose you are at the end of Eclipse and your choices are:
SF (eclipse) MF
or
MF sf (non-eclipse)
By casting MF first, Over the course of the fight, you have gained at most one MF tick (possibly not that much). Your expected "loss" is about 30% of a non-crit SF.
If the refresh is earlier in Eclipse, your gain goes up (more MF ticks gained, also more SF getting IIS bonus), but your loss remains the same (still at most one SF pushed out of Eclipse).
Every time I've tried to run tighter numbers (for either Wrath Eclipse or SF eclipse) I see results that say always refresh during the first half of eclipse, never refresh during the last quarter of eclipse (unless you don't have time to finish your nuke anyway) and from 1/2 to 3/4 duration it just doesn't matter very much. The break-even point seems to stay between 4-8s remaining on Eclipse.