Opinions please

I have some issues, and I'd like an educated guess on what's going on. Ph was pretty good on all these at 6.5-7.0 at the high mark . The problem plant is pictured in the right rear. Plant #1

Here's plant #2 Center of pic in rear.

Here's #3

Lastly here's #4 . These leaves were on bottom. Different ( better) soil mix on this one. This one had the highest ph @ 7.0. We've been watering with rainwater. It ph'd a fuzz less than 6.

Are you using calmag? If not, I would start.

No store bought cal mag or store bought nuets, but I fed some homemade from eggshells and vinegar 5 days ago. I added just 1 1/2 Tsp of it to a gallon of compost tea. My compost is made with leaves, grass, and veggie scraps, and composted horse manure. My tea was steeped with the compost ,kelp meal, and blackstrap molasses, worm castings, and the egg shell and vinegar mixture, and only bubbled for an hr before feeding.

The first three plants are my buddy's, and the last pic of just leaves is one of my plants. His guess on his by the charts I found online was it was a potassium deficiency , so yesterday I boiled some banana peels added a little sugar and fed most to his last night, and gave my girls a sip while too. I've been thinking of picking up something store bought to boost flowering, but not sure what I should get.

The containers look small to me so they could be root bound. Do those plants drain well? Cannabis does not like wet feet. The plants look hungry but I can't really tell you what to add or remove since I use store bought nutrients. Have you measure EC or ppm to make sure they are getting enough nutrients? Pic 2 looks like it needs magnesium so you could try adding Epsom salt.

No ppm meter, and not sure what EC is. I agree on the containers, and voiced my opinion when he planted. In fact, he and I were just discussing it again last night. I didn't have much trust in the soil ph probe type meter I had, so I bought litmus paper and while digging a little soil out of his to test....he was saying his roots were actually right under the surface!!! So, surely root bound. Another twist is his soil mix contains miracle grow soil ( tried to tell him not too) , so there's that mess I asked if he thought he should try to repot in something bigger in better soil, but I'm not sure that's even doable as those two are starting to flower.

Both his plants that are in pic #! are auto's as is mine. I think his pots are 2 gallon? Mine are in 3 gallon fabric pots.