yellow leaves in supersoil grow!! Need more food??

Hey guys, my plants are on about week 4 of flowers and I am getting a few droopy and yellowing leaves at the bottom of the plants, I have most of them in 3 gal containers and only filled with 25% max supersoil, maybe a tad less. I know subcool says they have to be in at least 7 gal containers to have enough SS to finish the whole grow with only water. My question is do these girls look to be P and K deficient or do they look like they are burning from the supersoil?? I can't tell..any advice gladly appreciated

They are definitely looking 100 times better than my last crop but I feel the colas are a bit small for their age and the plants are starting to slow down and loose vigor. Also the roots do not look as big and white and healthy as they used to when I popd a few out this morn and checked them.

I was thinking about making a guano/worm casting tea and maybe picking up some botanicare or advanced nutrients iguanna organic base bloom fert..and possibly starting very slow with a bit of that, was also thinking about giving them a dash of some maxi-crop seaweed to jolt the roots a bit...Just thought I was ask all you guys before I start throwing stuff at them as this was intened to be a no-additive super soil grow and I am scared to give them anything since this soil mix is just so hot!!!

P.S. I ph to 6 (yellow) with the colored dye ph test kit, water ph is always at 6

Outdoors is much diff than indoors but I see nothing wrong with your plants at week 4 I would expect the very lowest leaves to start fading
If your worried top dress em

Sub

nice, exactly what I did, and gave them a light dose of some tea...thanks subcool your a true medicine man...I will most definitely roll a fatty on your behalf...keep up your quest for DANK....

nice plants you go there mate

Is it normal for the leaves to go crunchy in some spots like that sub?

Yes. Part of the natural process. I know my name isn't subcool, but I have been growing long enough organically to know that is natural from the bottom up. If the plants start rapidly losing all fan leaves then you have a problem.