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Has anyone noticed, or have any explanation for, the following: Sometimes it seems that the very slightest nudge of the truss rod nut -- almost immeasurable -- greatly affects the feel of string tension and the tone, even when it's impossible to measure any change to the neck relief or the action. For example, before adjusting the truss rod the strings feel too "sloppy" and the first string particularly doesn't have any "oomph." After an almost imperceptable nudge to the truss rod in the direction of increasing the neck relief, the strings have more "rebound," require a little more fretting force, the guitar is way easier to play properly, the volume is greater, and the first string now excites the body of the guitar. I can't measure any effect on neck relief or action resulting from such a miniscule nudge of the truss rod.
I was wondering whether the effect is not so much any effect on neck relief and action, but rather on how, with the rod barely turned, the neck responds to pressing down on the strings and/or how the truss rod internally interacts with the neck.