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Yo friend where you get your info? Ph for hydro veg cycle is 5.8 ph max ec should be around 1.8 ec and if you use the proper nutes you dont need to add any cal/mg. When in flower ph goes to 6.2 to 6.3 ph and your max ec is about the same as when in veg. 1.8 to 1.9 max. Hitting up in the 1000 ppm mark you'll need as good an environment indoors as you get outdoors. With hydroponics when done properly will deliver bigger buds than what I grow on a regular basis. Cheers

If there is a lockdown there, then you can spend some time doing it, i don't see much of a need for it tho, unless you add some heaters too and using during winter with some suplemental light, wouldn't need much more light since you could also use a portion of solar even in winter.

Continuous drip with recirculation would do great if you can cover these parameters: grow medium aeration, drainage, and filtration (if reusing the irrigation water). As I mentioned in my other answer to you as long as good drainage and aeration is implemented, then overwatering and root rot can be avoided completely (I explained everything there). oxidized irrigation solution might increase root growth and overall plant vigor but wont replace media aeration and drainage completely, it's like suffocating your plant and inviting *HARMFUL* fungi to your root zone and plant.

First I would like to address the pesticide and fungicide, for organic pesticide (especially against aphids) I would base it on tomato leaf extract water since it has naturally strong resistance to pests (if you grow tomatoes in your garden you'd notice they're the only ones not getting eaten). For a good organic fungicide a combination of neem oil, dish soap, and baking soda would do great (plenty of recipes online that you can base it from). Now for the overwatering, Overwatering can be avoided completely by applying good drainage (from both substrate and pot) and your choice of a fabric pot (not sure if that's what you're using but seems like it from the few photos you have) is very good but the media mix you chose has poor drainage. The vermiculite is what holds nutrients, holds moisture, provides aeration and drainage especially when growing with soilless media (coco-coir), in your mix the vermiculite should have been at least 33% (1/3) of the media but what's done is done, for now I would suggest just spacing out your irrigation more and as indication water when the top 5cm of the media is completely dry just to give your roots the oxygen and room they need to grow (this also prevents root rot in the future). Lastly the nutrients, unfortunately I don't know much about organic fertilizing but I am able to recognize late stage potassium (K) deficiency on the second photo (green veins, yellow foliage, and chlorosis at the tips) which is probably caused by the low pH in your irrigation solution, since you are growing in soilless media I would suggest trying to raise the pH to around 5.5-6 with a slow increase with 6.5 as the limit. the first picture with the dark green foliage, light yellowing, and tip chlorosis is probably the same problem in an earlier stage plus a little Nitrogen (N) toxicity (from the three macro-nutrients nitrogen deals best with acidity) so you might want to consider lowering the nitrogen fertilization by half and slowly working your way back up. To conclude this long ass answer (which I hope helps) this is my subjective opinion to what your grow is experiencing and it is based on my experience. Overall your grow looks good and would probably do amazing if you manage to mend whatever your plants are going through, remember cannabis is a very resilient plant that can withstand a lot of stress!! **And my personal advice is always go easy with nutrients, deficiencies are easier to spot since they appear faster and cause less stress to the plant than toxicities!! Hope your grow goes well and the harvest bountiful :)

The curling foliage is probably due to radiation burns! from looking at your diary it seems like you're on a 24hr light schedule which may be tempting to use thinking it will increase yields it may actually cause what your plants are suffering from right now which is unnecessary and harmful stress! I'd suggest sticking with the 18/6 light schedule (some growers believe you can even push it to 20/4) since your plants need that dark time to actually burn that energy they produced during the day performing photosynthesis! As for the nutrient issues you're having I already addressed it in another answer to you. Hope this helps! Good luck and happy growing :)