Well an update. SWIM is happy to announce that his plants are starting to get better and seem to recover from whatever was the reason they were getting sick. What he did do is the following, which seemed to remedy their illness:

He added as earlier mentioned several bottles producing Co2. These are 5 in total, from 2 to 2.5 liters each. These are simply placed beneath the tin foil covering the whole plant area so that the Co2 will spread freely around to the plants. The Co2 production is simple: Add a tablespoon or two of yeast with a good 50 to 100 gr sugar. Put this in the bottles with a funnel, add hot water to the mix and shake well. Make sure to have the caps, with tiny holes in them (one hole needle sized per cap). This will maintain some pressure in the bottle yet release Co2 evenly for about 2 weeks before the ingredients in the bottle will need to be changed as it will turn to alcohol (as a note, SWIM added some fruits to his bottles so he is getting some extra "harvest" from the Co2 production as well in form of simple basic wine / cider).

Second thing he did was mix some RAW SUGAR (contains molasses good for plants), couple spoons, into a bottle along with some urine (about 1/6th of bottle volume) and the rest filled with warm water, shake well and let cool a bit before watering the plants with this. Good nitogen boos from the urine as well as carbohydrates and nutritions from the molasses (raw sugar).

Just days after this the plants shown significant health improvement and look much better. As seen, the Three Headed one is much better thought still some yellowish, at least its still growing and getting more green, and the one that was LST'ed and topped has started growing several new kolas which will be stems making one plant basically into several plants with several stems instead of just one - some topping was also done on this one.

Third plant has only been LST'ed and not topped or anything else, except for trimming some fan leaves to expose nodes to light. This one's too looking greater.

In addition, there are a couple new seedlings, among other one experiment with a simple hydroponic system using a wick, where pure perlite is in the pot, a hole in the bottom with a wick going into a tray of nutrition-water below which absorbs up into the perlite. So far so good, growing fine.

The last and final thing done was to raise the pots and containers the plants are in above ground level (above the oven pan they are placed in) for better drainage so it drips down into the pan.

Photos attached, compare with old for seeing the difference and new growth.