Sorry for the delayed reply and thank you for your response.
Well some of the buds are falling off now, but overall the top is not getting blacker.
Unfortunately, mother nature cannot seem to commit to a season right now where I live, and I have to keep moving him from different rooms in my house because of temperature fluctuations. Now he's in a west facing window that gets a decent amount of sun in the afternoon, but in a room where the temperature occasionally dips below 60F during the day. Now, I water him once a week, and have been fertilizing him every other week.