Plants look healthy and happy! You’ve gotten good advice so far, let me try to clarify the whole nutes thing.
I found the FF grow schedule confusing when I first used it. What might not be clear is why the different nutrients in different bottles. This is because they don’t store well together. In fact, there is a specific order to adding nutes to water that if done wrong will precipitate salts (that your plant needs) to the bottom of the mix water. But you normally need to run the two base nutrients together.
Bottom schedule lists as required are shaded in green. The cal mag is as needed (yellow). The others are add-ons. Mix is by tsp which is not a very accurate way to do it. Prefer to mix to a target TDS (ppm) and feed accordingly. Note the sledgehammer flushes: this is because FF nutes tend to collect salts in the medium that need to be removed. If you are watching your output TDS (which you are) you may not need to perform.
What pot, pot size are you in?
FWIW: you should put in another one of those lights before flowering them out.
I’ve since gone to Jack’s nutes and have found them to be the easiest and most user-friendly product to date. It’s also FAR cheaper than FF’s line. From two weeks to harvest and great results: this is my last plant harvested in October
Over a pound
My journal if interested:
Fun and Games in Colorado - Indoor Growing / Grow Room - I Love Growing Marijuana Forum
It’s best to open a journal of your own and confine questions to that. This keeps the visible feed open for more topics. It’s also way easier to find answers to old questions if needed.