Nut hieght effects frets 1,2 and sometimes 3.
Truss rod adjustments effect frets 2-17. Bridge hieght effects action and frets 2-24.
If you are getting a fret buzz on a bend, and nowhere else, this is due to your low action and the
fretboard radius. You can make small adjustments to the truss rod to give the neck a slight bow or you can adjust the bridge hieght until you get a happy median between action and buzz. Small moves.
It may be a slightly high fret, but I would try to adjust it out first.
J>