I did a decent amount of research on this fight. I've concluded that if you're CC'ing more than 3 targets, Hurricane/Astral Storm wasn't worth it and that you're better off multi-dotting.
You're probably talking about 10m? Because in 25m there's no way it's worth it to multidot.
Looking at the top 10m normal parses, the #1 guy, who beat out #2 by around 8k DPS, starts off with our normal single target opener, with the exception that he casts 1 astral storm as soon as he hits lunar. Then he starts multidotting and using SS, hits CA, continues to do so until solar. At solar he starts hurricane spam, interrupts it briefly for some multidotting (not sure why here, possibly because he had to move or something) and then continues on to hurricane spam til the end of P1.
Hurricane is 23.3% of his damage. Starfire actually comes next at 16%, with SnF and MF at 15.7% and 13% respectively.
The #2 guy's top 3 breakdown is SnF (17.2%), MF (16.5%) and Hurricane (15.6%). Like I said, he was 8k below the #1 guy.
It's hard to break down their parses very much, because one is in german and the other is in russian, but even for 10m it looks like hurricane spam is the way to go, apart from the opener.