It is a matter of taste, but I would offer that yellow is not a natural tone of walnut heartwood, which usually has admixtures of brown, black, maybe a bit of red, and less commonly a touch of purple (ugh!). If you alter your palette a bit, you may be able to back into a set of dyes/stains that are more readily compatible. Areas with worn finish on walnut usually looks like, well, just plain walnut.