Id just hit it with a flush @ 1/4 strength nutes and see how they react. I'd also try and free up some of those bud sites by taking some of those big ass fan leaves off.
If you're flipping them that small, you probably could have gotten away with 8 but the spacing looks adequate. They should fill up perfectly. Id put one over the top of them now(maybe 4-6 inches into the plant), and one more 1-1.5 ft higher and just get it out of the way.
That or do a...