what humidity are you having for the air curing part. in my limited experience under or above 80 makes a big differenceWe air cure the whole plant on stalks under fans because it's so small, it NEVER yellows and usually drys green to brownish green with all sorts of funky spots and weird colors in it before it's done. Afterwards we pick the leaves and toss the stalks. Once it hits the fermenter, then it changes nicely.