Could be from too much heat or low humidity. What are those readings? I grew a SCROG setup for years, topping every plant. Never had that happen, doubt it's related if you topped correctly.
Personally I like to see mostly amber but everyone has a different preference. Cut a cola now then harvest the rest in a week or two. Then compare and contrast.
If you get a solid soil mix going you don't need to add anything but water. Sprinkle some more guano on top of the soil during flower and add nothing but RO water. Perfect buds, no fuss and no way of messing up unless you overwater. Yeah you won't get the mega yields from all the high end...
I did the same thing and killed numerous plants before I went with soil. Wished I would have gone straight to soil. Evaporation messed me up bigtime. PH swings and nutrient burn like mad. Soil is more forgiving to the beginner. Just keep a close eye on your pH and the TDS of your nutes and...