........ And ........ Hook, line, and sinker.
This is that old story of someone who says maybe I can grow JUST a little bit on the cheap, then next thing you know......YOU ARE JUST LIKE ME! A Grow-a-holic. You have done an excellent job with theses lights, pls don't take anything I say as disrespect, I'm just going to be truthful from experience.
The light you have is a generic version that has been rebranded by multiple companies, they GET you with the 1000w thing for 59.99$ in reality those light's do not produce what they clam. On there ad, on Amazon it states "while only using 110w" this is the "True wattage" so with two you are only running 220w at max power, from the manufacturer clam you can have it at 12 inch for flower, Not really a good set of advice. led lIght is all about the PAR, Ppfd, uMol/m² and Dli and so on...I know TMI for now but you said " loving the info" so something to chew on before move up in light later on.😉 I'll get back to what you should do about full power soon....
Coco is a very versatile grow medium and that is why you are finding all kinds of different conflicting information about it. What one person does works because of the system that they use not because it's an all-around guarantee, let me explain with a couple examples.
1) some say water every time the pot are light when lifted, some say water 3 times a day, which one is right? The answer is both! Which is right for your schedule and environment is the better question.
2) depending on the environment, pot size, plant size, watering system, can impact your choices and the need for frequency of watering.
If you have 10 gallon pot with 20% perlite to coco 70°f and a R/H of 70% and a 5 week old plant you will kill the plants with overwater going with 3x a day, put that same plant in a 1 gallon pot and it will grow like a champ.
2b) exactly the opposite, 1 gallon pot, 20% perlite, 86f/30% R/h 12 week old plant in full bloom will have heat/light/underwater issues wouldn't be able to keep up unless you water multiple times a day. See what I'm getting at?
The tutorial on this website is a really good one, read it 17 times. My best advice is to pick a YOU style and need then stick with it. don't try to bounce around, which is hard to do on your first grow because you want to do your best and that is most like the cause of your problem, try to do to much.
Back to it.....
Jelly Johnson is some dudes Creation in a dispensary, remember most dispense are trying to get a faster turn around. Most likely its coming from the jelly line so Google HELLA JELLY or even JELLY STRAIN and you with find that most of that lineage, which comes from cookies is usually done in 50 to 70 days. Personally I'm thinking 77 day from the day you went 12/12 is going to hit it, this is why you look at Trichomes.
Sorry about the long post you said you love the info and I have nothing to do ATM 🤣🤣🤣. Short answer- If you can keep the light at 18 to 20 inchs id say go for it, from memory that's the distance that worked with them (850ppfd), If your trichomes look, under a loupe cloudy with amber then it's time to harvest no mater if you can get a clear picture to upload for us.
BTW welcome it the forum.