Stumac sells lot's of superfluous tools. I like using Atoma diamond plates to shave saddles. Heck you can get a 1,000 grit Atoma diamond pad and cut it in pieces and have a nail file that will last a lifetime
Most people run the mistake of thinking a truss rod should keep the neck dead flat, don't do that. One way or the other, a slight relief is better most of the time.
You also have to factor in string tension for setting relief. But really don't get too technical. Just make small adjustments. Hopefully you have enough saddle showing for break angle and such.
Lot's of harmonic wackiness is usually factory nuts aren't cut so great for strings. But I wouldn't necessarily order an expensive stu mac tool when many cheaper DYI solutions exist.