Leaves yellowing and burning mid flower

She is wanting potassium and phosphorus. Little nitrogen. You have had a strong mix of it prior. Would check run off ph as well. Might have a ph swing happening.

Yep, pH way too low, up around 6.2 for flowering when in coir. It is definitely not a lighting issue or anything to do with plastic pots or training. Fertilizer is too high in phosphorous and too low in potassium too. A pH of 5.6 will also make trace elements unavailable, which is another issue affecting your plant. Next grow get some proper cannabis fertlizers, if you like organic, the Bio Canna line (Bio Vega and Bio Flores) is very good, as are the products put out by B.A.C., (organic grow and organic bloom) - all are one bottle complete nutrients and super simple to use, and most importantly, work and work well. Add some mycorrhizae like Mykos from Xtreme Gardening and your plants will grow by themselves and as if by magic! Hope this helps, Organoman.