And to clarify soil buffer , you keep hitting the wrong ph , because your ph meter is off, or whatever ,buffer or not your going to experience problems.
Hookah is right , light top dressing , and or let it be the plant its using its own resources that's what they do , thats all depending to that its week 4 or more into flowering.
Recently change my method to root riot plugs in a close plastic container on heat mat no more handling/transplanting to medium just insert into medium when ready.
Was happy with my Nirvana NL ran her 4 times , good stuff , but im looking to do the same wider variety perpetual. Gets kinda old smoking the same stuff.
Yeah that some stretch and looks to be full blown flowering, could just be light spectrum and shock from light schedule change. Making her think game on.
What about that PM on the other leaf , white powdery mildew looking stuff? Also I would remove leaves she is taking what she needs from them I beleave.