If that is the % of nutrients you are giving them you are missing a lot. Raise the humidity a bit as well but have it follow the life cycle of the plant. In veg they thrive under 70% to 80% then drop it 5% a week until harvest.

Next you are feeding the same plants at different life cycles all the same nutrients. That is not a good idea if you want to get the most of them. Early on the life cycle it's important to provide the proper nutrients in the proper amounts. There is no real general formula for every plant there is a guide line but each strain at each cycle of life is a little different and to get the most you should respect those little changes.
Zandor Reviewed by Zandor on . How can I Improve my Yield? The answer is... Here is a summary of my room. 1. Type of grow- hydro NFT (Homemade Areoflow tubes) 2. Age and strain of plants Bigbud, Been growing the same stain for 2 years now 3. Type and ratio of nutes -I use Liquid-earth nutes from FutureGarden.com at the rate of 1200 ppm ph of 5.8 Current NPK of: 178-131-327-?? Nitrate N NO3 155 Ammonium N NH4 23 Urea N NH2 0 Rating: 5