Greenpassion, Brother your doing a great job with your plants.
They have come along way, pretty quickly.
That's the way you do it with KindSoil, just like you are doing.
You don't want much runoff at all, just make sure the bottom of the pot is good and wet.
The first few I grew using KindSoil, I had a good bit of yellowing,
Yours are still a little early to start turning yellow, but but come close to harvest time, the whole plant is gonna turn yellow, it's supposed too.
On your one plant, that's got a few yellow leaves, I wouldn't worry to much, about it unless it starts spreading.
You are using cal-Mag ,aren't you ? Or you using tap water.