You've overdone the nutrient for sure, or your ph is far too low, or both.
Soil - plain water rinse, no ph adjustment if between ph 6.5 and 7.5. Wait for signs of improvement before giving any nutrient again.
The soil may have ample nutrient for now anyway.
Hydro - rinse with a very light nutrient solution, ph6. Then resume normal feeding schedule with lighter feeds.
Generally sativas are lighter feeders, just keep it in mind.
Touch and go, but the plants should turn around.
Best of luck!