Don't finish the watering with 1400 ppm! Water with regular pH'd water, no nutrients. She has plenty of nutes built up in the soil, she doesn't need fresh nutes yet.
Get it down to 1500 ppms first, then reintroduce whichever nutrient she needs most. If you're vegging, then she will need N and micros. If you're in flower, then she will need more P and K. This way she won't experience any deficiencies in the meantime. Keep the ppms low until she gets down to where you want her.