are you using a 24/0 day night photoperoid or 18/6 i have had to do this myself a few time the plants react better to 18/6 than 24/0 . if you can some superthrive cal mag+ and i high nitrogen nute and they will do there thing and when they revert back to veg they will start growing deformed leaves at first but will come right in the end best of luck .the postman.