Ive researched this exact topic to no ends. The consensus seems to be, Genetics are the key. So to say, waiting extended periods doesnt increase CBDs. It increases CBN (what thc breaks down too). Now CBD and THC effect each other VERY DIFFERENTLY then CBD and CBN (sleepy meds).
So in that case, CBD content is basically decided from birth. And it ripens first (before 100% cloudy) and doesnt breakdown nearly as quickly as THC (amber pistils are degraded thc). So the harvest window is wide open. Id love to see some lab tests confirming it either way… but studies just not quite there.
Long story short. If ur harvesting the CBDs for a topical or nonpothead to use medically? Id definitely harvest at as close to all cloudy as possible.
If its for a pothead, amber wont hurt a bit
If its for sleepy meds, the more amber the better