I have started the first week of flowering with Grotek fertilizers, pH 6.4 and EC 2.83. My plants, after 2 days, look like this, so the soil might be dry when checking..
The recommended EC in the first weeks of flowering, I understand, is from 1.2 to a maximum of 2. Yours is exaggerated... later in the flowering stage, you can raise it to 2.4, but that's the maximum.