Secondly the nutes are liquid, diluted in water, with the ratios that are suggested on the packaging(in 1 lt bottled water)... I feed them with 5-7ml of the solution...
Not specific enough. No.
7ml is 40% more nutrition than 5ml. So is it 5 or is it 7?
Run off is also very important, especially when feeding soil with nutrients.
When you refer to the solution... You claim to be using 5-7ml of "solution." Your choice of words is extremely confusing.
For something this simple just understand that the failure is not yours. It is the grammar school you attended that was supposed to teach you how to write a descriptive paragraph.
I don't understand why it would ever come out like that... It's so simple.
I have Brand X Nutrient solution. It contains an element profile of x-y-z. I use Xml of this solution in one gallon of water. I do not measure the pH or know the electrical conductivity.
Water when it is dry. Not according to some schedule. Mineral water is extremely expensive. Why go through the trouble when Spring or RO filtered ware costs a few cents per gallon.