I don't see you having a problem with bud rot , your air flow is fine and humidity at 50 % is ok . 63 days is to soon , at least go for 5 % amber to have the plant at a mature stage to harvest to get a higher THC content , The last week or so with amber is showing is when you will hit the THC content . I like around 10 % amber . impatience is not good , you have come this far so another week or 2 is not going to hurt .