Yeah cutting fan leaves off doesn't create more nodes. I know this bc I cut off several fan leaves and there are no more nodes than there were to begin with. Don't cut any leaves off.
What lights are you using exactly? Like brand, etc. It seems a lot of ppl here state their light specs differently. How far away are the lights from the plants? They look pretty stretchy but not bad. In my entirely unprofessional opinion you should wait until the stem looks like it could hold significantly more weight than it does now... It's soooo skinny. Depending how much bigger it gets, just based on looks alone, I'd say about a month till I'd feel comfortable flowering. Idk anything about organic nutes, sorry!
And yes what the guy w the hairy naked avatar said re: size. Our big female has been in flower about two weeks and has grown four inches, I shit thee not lol. 21" tall today actually. Anyway good luck!