I grew this strain for several years and the one thing I noticed was that it did NOT like a lot of nutes. I had to use about half the amount of nutes that I used on my other strains. Also feeding plants nutes as young as yours is not good practice either. If you want to try an experiment, just take one of your plants and feed it and let the others use what is in the soil and see what happens. I usually don't add nutes for at least 6 or 8 weeks of growth as the soil contains all of what they need up until that point.
I got really good volume out of Nirvanas WW and in that respect it was a very good strain. The only reason I quit growing it was that I found other strains that I liked the smoke from better.