Diff nutrients get utilized or not within a ph range depending on where it falls. Theres a chart somewhere (complete) Kashmir- A place for my Freaker grow - #360 by George
From the post before that chart it seems some people recommend a 5.8-6.0 ph for coco during flower. Reading just a bit more others seem fine with your 6.2.
I’d probably trying lowering, but your plants definitely dont look bad and I’m sure they will finish strong even if you don’t change anything