Hey Girl... don't panic at all. Everything looks great. As the plant matures and isn't getting enough of certain mobile nutrients, it will steal those nutes from the leaf materal and why people should leaf strip close to harvest. Or remove leaf turning colors. this is all good and part of maturing.
Don't allow them to completely dry out. I too found going to a 3gal pot is best, and, starting them in 2ga
felt pots they will fill that pot up with feeder roots fast. almost need a drip setup huh? I know I do as I'm giving mine 4cups a day now, food every other day.
As you get 10 days from chop, stop all foods cept maybe a carb loader/terpene enhancer.. I use Sweet or
the likes.. Flush them girls good, last flush add the sweet.. it really adds to flavor, many use Black Strap Molasses but it can leave a bad taste on some strains so I changed..
You want your leaf material to change colors starting with yellowing, oranges and going even purple as the plant sucks all the nutes that are mobile from her as she crowns up like little roses..
IMHO your killing it...