m0useanswered grow question 9 months ago 25ml per L for feed is a lot. It might be getting locked out.
I would be watering with a bit of runoff when feeding this strong to prevent buildup and lockout.
It might also be a good idea to get a TDS pen to measure EC of your feeding solution and and monitor the EC of the runoff. Would not hurt to check its PH as well. This way you know its not to much and don't wait money on more nutrients when its not needed.
The signs and symptom are pointing towards Nitrogen deficiency But I think its mimic that from a build up or wrong PH.
Your week 14 looks to have nitrogen toxicity at 21ml/L total feed so leads me to believe its buildup in the medium.
Good Luck!
