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- fine-ass '22 harvest!
...yeah, that looks like normal fan-tapping for this stage, plus the low light factor,..... I think you had a pH hiccup that messed with K temporarily,.... Do check the pH every day, especially now that you're feeding less... with lower conc. of nutes, you also have lowered buffering capacity that those nutes offer,... in fact. I'd ease the conc. back up, as P-K demand is highest right now...
Did it arrive with the tip hydrated? I just want to be sure about this reading 
... damn, that's bad alright,... This is an Autopot plant too? OK, even if the probe is off (and it shouldn't be, buuuut..) by more than 1.0+/-, pH this low will lock out many nutes! The res' pH is ok, I'm sure you checked,.. so this is what's going on in this pot alone-?...., but what's driving it this low is a mystery; do you have an EC or TDS meter? TYhis is also something important to have with coco/hydro especially; A hint might be in the ppm/EC reading of the run-off; if it's really high in ppm/EC, then that nute build-up is aprt of the source of the low pH, plus what the roots put in during cation uptake... How does this plant look right now? ... I think a flush is in order, a different deal in coco vs soil/peat,... you have to make a specific solution for this, so you don't screw up the CEC dynamics in there...
