have never been an advocate of slight color changes. I fish color that conforms to conditions. I more acknowledge that a change of location is way more important than a slight change in natural lure color. Thousand and thousands of both guide and fishing trips have sent me in this direction.
. I agree, color of individuals Vary, changes slightly depending on lighting even a fishes mood…profile seems more important….I have noticed bait minnows like fatheads, the males with dark head reading colors must not taste as good as an egg seeping female
As far as feeding locations…..some places fish rest some are where they feed…..current, ambush location, of the insects in a micro location are all hatching/molting/mating