I've read a few, but a lot of Flurry stories have her growing up to be a genuinely unlikable little spit. Any where she's not or only amusingly naughty?

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You have my story about her in your "Read Later" list already. She's not a little brat in it, on the opposite, she is a very mature and well-mannered filly (but can still get naughty) in this story.
And then I have the start of this story, where she is a little annoying, but more of a hyperactive teenager, than a brat:

https://www.fimfiction.net/story/406147/my-little-pony-guardians-of-crystal-growth

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I'll check it out.

You can check out this one as well.

No Place Like Nowhere

Flurry Heart and her parents are misteriously teletransported to a forest with no memory of what happen or why they got there. Flurry is pretty likeable on this story.