So I did some looking, and based off your 600 ppm I'm seeing 9.7 tsp of A and B per 15L of water and 8.4 of the rhizo, its showing an EC of 1.1-1.9. I hope that helps. Also you mention her being short, could she maybe be needing some more dark hours? Maybe a 20/4 instead of the 22? I had 1 of my plants get very angry and show the signs of her exposure to high light hours, but that could just be that plant.
💚 keep it up, I'm sure she'll shoot up anytime soon.