my first autos & first diary

Bro your PH is too high : 7ph in coco isn't recommended, you should try to stick to 5.8 to 6.3 with a sweet spot at 5.8 so it is the 1st reason why your plant could/will remain short and have deficiencies. I see in the comment that you found a solution against spider mites : I would recommend neem oil to keep it organic. Concerning the temps I would try to settle a difference between day and night temps just to imitate the natural environment parameters. Last observation : your feeding chart looks weird , try to find the flora series coco chart on Google and tweak it a bit if you want And don't forget that coco requires more nutrients than a soil grow 😊👍

To be honest with you at that very moment what you need is to read some articles about coco growing because a short or even long answer will not correctly feed your need to learn more about coco grow. So I am posting a link to a well known website for you in the comment section 😊

That has a lot to do with how you want your plant to look . At this point it may be to late to just trim off some of the branches as that will cause lots of stress to your plant and slow down growth , possibly even stunt it or turn it hermie . I would say that 20 branches is too much because some of the canopy will be to thick and some of the lower branches may not get the light they need to fully form the flowers .Usually when growing you would remove the lower branches on the plant in order to try and achieve and even canopy so that you are ensured all your tops are getting the same light and grow evenly . At the end of the day tho its up to you on how you want your plants to look and grow . I hope this information helps you understand the choices you have and the proper time to remove lower branches on your plant . -Happy Growing!