My plants were in 2 gal pots so I just ran about 3 gals of tap water which is a little high here at about 8 ph but I then ran the last 2 gals of ph'd 5.5 water kinda hoped it would balance out a little left my run off at about 6.8-7.3 ph my ph tester isn't the most accurate and does .5 increments. If your plants are showing signs of better health I would just keep watering with what your using and check the run off ofte for the next few weeks and maybe even start adding the nutes again when you feel more comfident the plant is healthy. To get it thicker you might want to leave the fan pointed directly on the plant running as high as it can to build strength. I am new to this myself though just posted cause we used the same nutes and had similar problems. I even use the same humidifier lol. Good luck on your grow and just remember you're alot further then most that just dream up plans all day.