well if it was ph then my problem would have happened ages ago.... and after doing all those things; cutting leaves, ventilating, and C02 the plant actually has gotten alot better.
I bid you good day sir.
Did you figure out what the issue was? They do look a LOT better now.
Maybe, you are in an area that has water already in an acceptable PH range.
But if you start having problems like this again...
I might be wrong on this and if so please somebody correct me (so I can learn more), but, my understanding is that young plants are not in as much need of nutrients vs water (wether you are using Hydro, Aero or Soil at the earliest stages you are not adding nutrients typically only water right?), so in early development PH is affecting the soil/medium your plants are in more than it is affecting your plant itself. In other words, since your plant isn't needing very much in the way of nutrients, lock out isn't as much of an issue and you don't see this as much in younger plants. Don't get me wrong, if your water's PH was off too much and was closer to battery acid or Hydrochloric Acid then pouring in the plant at ANY stage would probably kill it, but being off by 1-2% will not be as noticeable at the earliest stages of growth. But during this time your soil is soaking in this water and that water is affecting the soil's PH level, over time this can turn your good, well balanced soil mix into a deposit field for the nutrient(s) that the plant is not uploading and using, causing later problems when your plant is starting to need the nutrients that are building up in your soil. If unchecked and allowed to continue, it could get to a point that the plant starts experiencing lock out issues.
Glad to see your plant is better, hope this all helps and good luck!