What you can do if you have the time and interest is to try lower it 200ppms from where you at. Look at the plant and the numbers, see what happens.... Then try raise 200ppms and again, look at the numbers and the health of the plant. You will solve the problem and you will also learn to know your plant and understand what happens for future grows.
If one thing doesn’t work, do the opposite, that’s how I learn.
If one thing doesn’t work, do the opposite, that’s how I learn.