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That is a strange place to have 1 high fret.
Just tweak your truss rod a smigen more to make sure that is the problem. If that cures the problem, then put your truss rod back where you had it and take a triangle file and slowly remove just a touch of that fret. you have to be careful with inexpensive guitar neck adjustments . you take too much off of the fret and the 16th fret will start buzzing and you will end up chasing the problem all the way to the last fret on the fret board.
You can buy cheaper files on amazon or go to the Guitar Nomad site and you can get a cheaper set. Again the Amazon feature of free shipping might be where you want to buy the files.