Tick tock tick tock, growth is primarily dictated by how how much energy she has to play with each cycle. Each phase of growth dependant one one before it.
We don't grow plants, all we do is facilitate the energy conversions.
Your plants have not been cycling/converting very much energy/atp for your plant to be so small.
9 cardinal metrics for plant growth 4 above, 5 below. If any one of those 9 bottleneck, the entire plants growth is energetically bottlenecked to that %. Doesn't matter how much carbon you catch if you only convert a portion of it.
You can veg photoperiods for 19 weeks and still have lanky lacklustre budlets. As soon as the flip begins the countdown begins and shenis ruthless.
Fundemental principle in plant biology: the more energy you have to play with the more growth will happen.
Im also aware it is a complex process that I have grossly over simplified but none the less, the principle remains: Plant biology supersedes cannabis cultivation.
What is optimal for photosynthesis and carbon fixation is not optimal for cellular respiration and carbon assimilation and until one balances the fixation with assimilation and actually understand what this paragraph means you will never have fatties. Fixating for 18 hours to capture 40dli when you only assimlate 20% in the 4-6 hours of night under sub optimal conditions with 70 RH% and oversaturated soil crippling the entire assimilation of carbon to almost 0.
Once all water is removed from a plant 95% to 97% of thay dry plant matter consists of carbon, oxygen and hydrogen.
The other 3-5% is NPK and allll the rest.
Plants look massive size, its asking alot of autoflowers in 5-7gallon pots. I believe my diary #12 iirc was 4 auto flowers 86 days, 145g dry each plant. All you need is a few tidbit tweaks to your setup those links will be massive cola. Keep on it, you are so close to the wow factor. Best of luck and very best to you on your journey of growth.