for vegetation cycle 1400 is a bit high. 1000 is more like a good number for veg cycle just before you switch to flower. You may be giving it a bit to much N with PPM that high. When you are in the second week of flower you change from veg cycle nutrients to flower nutrients. You don't switch to flower nutrients formula the same way you switch the light cycle. Give them a week to make the change first and you will have fewer problems at the start of flower. A flower booster is good to use at that point too. It does help them kick into flower faster and fatten up the flowers too at the end. A good booster is used only the first week and not again until the last 2 weeks of flower just before you flush.