What could be causing this

Hi all, still trying to pin down my plant problems. Hope someone here can help. Several months ago a weird ailment started showing up in my grows. It affects about 15-20% of the plants and doesn't seem to be connected to the growing medium, nutrients, temperature, or humidity. It's happened during veg and flower, hydro and soil, ionic, botanicare and an nutes, in two different rooms. The first sign it is occuring is that the new growth will be wilted and mottled, with curled leaves that have raised edges. Growth doesn't seem to be slowed though, just stunted with very narrow leaves (I thought humidity at first but it's at 50%). I have a 12 plant scrog 5 weeks in and right now 3 of the plants are displaying this issue. buds appear stunted and odd, leaves are stunted, mottled and narrow. Yesterday I discovered a bad aphid infestation in this scrog and thought this was the issue, but I am having the same problem with one plant in a 6 bucket dwc system and 2 plants in a 6 pot hydro bin in another area of the room. The rest of the plants are the same strain getting the same nutes in the same medium and are not affected. I immediately inspected the affected plants for aphids but there are no insects or eggs on the plants or roots, so I'm suspecting that my aphid infestation in the scrog is a second problem and not related to the poor plant growth, but I am not sure. Below are some pictures of the problem. Can someone please help?? Thanks!edit: Something is wrong with the website right now and I can not upload the pictures. Hopefully soon.
 
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