Just like watering, there is a balance to feeding your plants.
Use too much nutrients, and your plants growth will be hindered. Use too little nutrients, and your plants growth will be hindered.
9./ Your plants need time to grow. There is no way around it.
Every strain of Cannabis is going to grow at different rates.
Some strains will be ready to flower after spending only a month in the vegetative stage, while some strains will need two months or more.