DPET of Starsurge is just wrong, like Starfall it's a 1.5s cast, so it's:
DPET:
Starfall = 165% spd/s
Starsurge+2x30% SF = 211.2% spd/s
You want to cast SS on single target and Starfall with more than one target.
But i'm pretty sure there will be a new cap to starfall, because it will be waaaaaaaaaaay OP without
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If it will be optimal to cast SunF at the start and end of solar, you can cast it on the run through all solar and you can cast MF between start and peak of lunar. In any way you can cast the DoT between start and peak of eclipse. It seems like our movement damage is not so low as i thought it would be.