No, no. You don't just skip food on Colibri, you bring cheap shit. Meat Mithkabobs. Which is the exact reason I suggest you wait to level Ninja. If you're going to gimp out on gear and food, don't play it. This is not me being mean to you, this is me telling you you're going to be a hinderance on your parties if you do. I understand you probably have gear leftover from DRK and BLU, but after reading some of your other threads about your gear choices on either job, I really don't see you forming yourself into well-equipped Ninja.
As for the tools, yeah, you need to have them on hand from 40-55, at the very least. If your nukes were landing for 10-20, something is wrong, or your Ninjutsu skill is far, far from where it should be, because average damage on them is 50~90, with 50 being an extreme low.
Again, I'm not trying to be an ass, but they say Ninja is one of the most expensive jobs to level for a reason. There's a very good reason people frown upon Ninja who selectively play with crappy ass gear and think nothing of it. Sure, I know you're a decent player, but believe it or not, gear does play an important role in that job. You won't always have haste, you won't always have erase even, and you'll need to substantiate. With 200,000 gil, you won't stand a chance at properly equipping yourself.
Just my two cents.