@NaturalGrowG, from what I can see she looks like she has grown to her maximum size. Using nutrients are not relative to size they are determined by individual plant requirements.
From my experience and research I’d say she looks like she needs more K take it however you wish.
In case of a K deficiency you want to be looking at adding more bloom taking away the grow all together at this stage you’re delaying harvest by adding N. By your calculations you’re 5 weeks into flower. The dosage at full strength at 8 weeks is 4ml/L you’ve got it at 1.5ml/L I know most people tell you go half recommended but with biobizz you can easily go over and see no issues. Point number 2 don’t listen to everything you read onlin listen to the plants, do your own research check it against other sources then make your decision on what to do. I say go search K def cannabis in google see what you think, peace out fella✌️🏻
She looks awesome great job! This diary makes me hope one of these pops in my mystery mix. Keep doing what your doing and best of luck with the rest of your grow