Northern Lights / Tangerine Dream

Week eight was easy with almost no incedent. I noticed yellowing on one single branch of a plant. The next day I went to investigate the stalk and upon moving it, the entire branch fell right off. Upon inspecting the base where it had broken, I noticed the stem to have a woody brown core. I believe maybe the branch was tied down too tightly and it caused a split, which dried from the inside. Haven’t seen it on any other plants Besides that they mostly take care of themselves and need water every ~3 days. I’ve noticed some color differences between the northern lights, with one plant yellowing significantly - but growth remains strong. I’ve fed them according to FF trio schedule and always with calmag. Trichomes are mostly cloudy with some clear. I want to give these as long as I can to fatten up more, hoping to have two more weeks till harvest. Any thoughts from the trichs? Or when to flush?