First Grow

You should be feeding every time you water if you want to use liquid nutrients, secondly I would not use a ratio of 0.8ml/L I would look into getting a EC pen and managing it that way. EC is universal and will let you know how strong the feeding solutions concentration is. Autos also don't feed as much as photoperiod plants so giving them to much can cause them to go into shock and flower early. it is said anywhere from 1/2 to 1/4 strength is needed for autos. I would also not be topping autos as they don't normally have the time to recover from the stress. The extra stress can also cause them to go into early flower. Remember to get a good amount of runoff to prevent buildup. Good Luck!

Hello my friend, the cause for the leaves to hang like this is overwatering. You need to let the soil dry out in between waterings. You want the top inch of the soil to be completely dry before watering again! The roots need oxygen too and as for now they are lacking oxygen that is why the leaves hang like this.