Having spent time in a tunnel and in front of a green screen going narrower is a crap shoot. Hands width, whether narrow or wide (relative to you) affects shoulders which in turn affect head position.
As far as isolating narrower hand position the wind tunnel guys said no people are alike in how the stream of air flows around wider or narrower positions.
IMO this is super high hanging fruit. Comfort is king. If comfortable up front you can sort of melt into position. Shoulders relax and narrow. Head can get a touch lower and out of the wind. Both cause frontal area to lower=a very good thing.