Just buy some proper, cannabis specific nutrients!
Why go to all the troulble, effort and expense of setting up a grow space then use a mixture of generic garden fertilizers designed for brussel sprouts?
Do this and all your problems should go away and you will then harvest decent flowers.
Everything you need is on EBay!
Recommendations?....
Bio Vega and Bio Flores made by Bio Canna,
Organic Grow and Organic Bloom made by B.A.C.,
both these lines are one bottle for veg and one bottle for flowering....
Otherwise...
General Hydroponics (GHE) products,
Canna products,
Plagron products,
Hesi products,
Top Crop products,
which are all available online.
Mandala Seeds have an excellent "grow guides" section on their website, it has a lot of great information for (European) growers and this may help you to get a better harvest.