Woah, 1,2 - 1,4 L is far more than i use to water my plant with.with 18 liters pot i gave them 1,8 liter every 4 days ,
perhaps try 1,2 - 1,4 liter for now and you ' ll see if you need to raise it .
I use to water her with around 500mL every 3 days, feel so bad right now.