I would carry at least 1 fire tempest like spell. It's really great in gank situations or when people press too hard. It's really strong even with just bellowing so if you go crown on it I'm sure it'll hurt even worse.
The fireballs are pretty good when aimed, but do you really need so many? Consider dropping some for something a bit better at pressing turtles. I'm still not sure if fire surge is worth it, or going for more GC or even regular combustion (I've landed quite a few kills vs people assuming I was out of combustion pokes).