Not budding?

I would just knock a few hours off the light schedule and leave it a week and see how it's doing.

Hi we can see the the same bronze / purplish patching o leafs on all plants. I would: check if your water is unchlorinated, then I would check Ph of soil and mabe check if your not overwatering. In your growdiary you state a half a liter a day, I f you do this every day on potsize of three liters, you are definately overwatering. Give maybe one liter every time when dry again. Your problem is too little medium for the nutrients to be stored and broken down in. So roots are competing with soil. If you want to safe it: Give it a bigger pot with some coco, wormcastings, feed her noting but P and K coming weeks! Good luck!!

So ultimately when a plant is under that much light they become lazy in flower, I would recommend dropping to an 18/6 for a week then see if you need to go to a 12/12.

Looks to be a slow developer. You have lots of red/orange pistils and also lots of immature white pistils too so it's already well into flowering mode. I don't think change the lighting hours will have any benefit. From looking at your diary it seems this plant is only at week 5 of flower. Give it some more time.