Exactly,
Head Winds & Tail Winds never are... they just bounce to either side giving you more left or right at any given moment than any vertical change.
Terrain will cause more vertical dispersion under windy conditions than what is considered a Head Wind / Tail Wind Effect...at the end of the day, without terrain to exaggerate the effect, you cannot hold the vertical component it is too small to worry about. Add in some terrain, and even a crosswind will cause a vertical dispersion. Worry about the cross wind component and not the vertical.
David Tubb has also done some extensive research on "dissimilar wind drift" which is incorporated into his reticle. This discusses the vertical changes caused by wind based on the direction of the rifle twist and the wind. So you want a rifle twist that works with the wind and not against it. He uses rifles that are both and left and right twist then chooses the one to compete with based on the wind direction.