Yeah that was me who posted about the zero glide. No offense but it sounds like the install wasn't done very good. It shouldn't take a luthier 5 hrs to install a zero glide nut. I'm no luthier and it took me about an hour and the bulk of that time was spent sanding. Once I had everything sized properly I gently filed the edges of the zero fret and than went over them with sand paper, in other words, I removed the sharp edges. The radius of your fretboard won't matter as the strings when tuned up will make the fret take the shape of the radius. As for my install, I can honestly say the strings are all sitting the same height and it did improve the feel of the guitar, not by lots mind you, but it is noticeable.
IMO these zero glide nuts are really easy to install yourself as long as you know how to use some sandpaper. If I were you I would take it back to the luthier who did the work.
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