Start off light for the first week or two.
When you see the ppms dropping 50 to 100 ppm then increase the doseage next time up by 100 to 200. Thats what i did. If you start to see burn or if the plant drinks and the ppms go up back it off. Its better to be hungry then overfed.
My seedlings took 200ppm my veg was 600 transition was 900 bloom is about 650
I also pushed her so i burnt her a bit