I’m not familiar with the brand. I took a quick look I assume it is the 3000. It is using lm301b diodes, that is positive. At 18" it looked like upper 900 ppfd which is solid. The reason I asked was the how stretch out your plant is. It looks like through out the grow the light was set higher than it should have been. The spacing between the nodes got too big and the flower just could not fill in. Also, a little training like LST helps a lot. I see you are doing GDP photo next time. I have GDP seeds and hope to do them soon. It is a more naturally compact and dense plant. In its case it kind of goes the other way. You may want it to stretch a bit more than it would otherwise. The other thing you are beating me to the punch on is coco. I have some all ready to go for my next single auto grow. You can check out what I have going on at An auto, three photos and a clone
A little bit of everything.
Now that you have flushed, keep an eye and ph and feed her. Not sure how high you have the light but during flower 900 ppfd is a good number to shoot for so drop it down a little bit over the next couple of days you get to 18-19 inches.