having a plant in a 10L pot doesnt give the plant much food to work with. I hate suggesting a re-pot during flowering, but its hard to believe that plant would get hurt by doing so.
You definitely have a nitrogen deficiency and likely some micro deficiencies. keep in mind, too much N will slow flowering, too little N prevents the plant from
being able to complete basic functions.
You will know you are adding enough nitrogen to your plants when you start to see your leaves getting some green back in them.
Forrest green, and curled leaf tips= too much nitrogen.
Try repotting, and just water with plain water for the first time.
Next water, use some nitrogen with your nute mix along with a micro supplement like cal-mag.
If you would like, just let me know what nutes you use and soil and I can give you a basic feed schedule that will get you through with
much better results. temps, strain, and humidity are helpful as well.
feel free to pm me if you have questions.


hope this helps...