Ok so a decent rotation with that glyph would be insect swarm, moonfire, 3x starfire, then spam wrath till the dot's expire.

Ill have to test but I think my starfire casting takes 2.3 seconds so not much of a time gain there to get more wraths off before refreshing, but 9 more seconds of a dot is going to be a nice increase in damage per mana as I already have the moonfire glyph that does 75% more dot.