I finally got the neckline right after a 20 year guy in Lubbock told me to stop cutting with the clipper flat
For years I fought with that shelf of hair at the nape on guys with cowlicks, tried three different guards and even bought a $90 taper blade, but tilting the clipper just that little bit and going up instead of down fixed it in one pass, so now I'm wondering what other basics I've been doing backwards this whole time.