I've got a 50 fire/ice blaster that's soloable, but I'll mostly run in groups - a couple comments:
I'd skip flares, it's not needed for a single-target rotation, and the damage just doesn't compare. Likewise, I wouldn't bother slotting chillbain - it's just not worthwhile once you get other attacks. I've not taken Frozen aura at all - not a fan of sleep-type holds (and you have Inferno for a PBAOE damage....I'm not sure how useful a second one would be.) I haven't used bonfire, but a knockback to knockdown on it would help make it more useful.
Rain of fire is absolutely worth taking, Dropping a rain of fire on a group of enemies flopping around on your Ice patch does not get old. I'd also recommend shiver (slotted with Pacing of the Turtle.) It pairs really well with fire breath, and keeps groups together (when they're not trying to charge in slow motion.)
Overall, looks pretty good - it's a fun build, and should have insane damage with good survivability (for a blaster.)