leaves yellowing, thought it was a n deficiency

ive got two plants going, ones thai tanic the other is white widow, both leaning on the sativa side, both of them showing signs of interveinal chlorosis, and showed almost every sign of a N deficency, ive been underfeeding rather than over feeding, last time i gave them a hefty dose of nitrogen as well as repotted them since they were starting to get root bound, they are growing horizantally, i gave them a good dose of nutes all around (NPK) as well as put them in fresh foxfarm soil.. since then the yellowing is still working its way up.. theyre about 3.5 weeks into bloom, i cant post pics now as im at home, however if its a must ill post some later or maybe a reference photo any suggestions would be great im losing all my fan leaves however the buds are still growing fine, im sure they could be growing better

When did you repot them? Have they been flushed at all? What kind of water? What is your runoff pH?

too wet? ph too high,not enough ventilation.Well its got to be one of these.Try a couple teaspoons of epson salts/litre of water as this will bring the ph down or a sprinkling of lime

ph is fine, it was repotted 3 days ago with fresh 6.5 ph soil and watered constantly with 6.5 ph water, yellowing has started way before the repot

How are your plants?
My plants are doing the exact same thing you are experiencing.
I would like to know if you have solved your problem or not. And also what have you tried and/or have not tried to correct the problem.
Peace