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But when i look on the neck from the side, the string height is higher on the 24th fret than on the 1th fret.
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Means it's probably not a backbow issue (and yes, that is the way it's supposed to be). Either way, it's easy to find out if it is; fret it at the first fret and last fret simultaneously. There should be a just barely visible gap at fret 8. If there is no gap, loosen the truss rod; if the gap is more than just barely visible, tighten it.
Also, Ibanez guitars are originally strung with D'addario XL 09s, so that's not the issue.
In all probability, it's a technique issue. Pick with less force, make sure that you push the string down right next to the fret, and push down a bit harder. Also, make sure that the neck isn't twisted (although, I doubt that's the issue).
And yes, it is normal for an electric to have a bit of buzz. When running it through distortion, it should be almost inaudible.