Hey!
Every time I mix my nutrients and I get a PPM higher then my original goal, I just add plain water which drops your PPM. Yes you are diluting your nutrient solution a little, but your also kicking down your PPM levels so it’s totally fine. Also, make sure you adjust your PH AFTER you add your plain water, PH always at the end. And no you will not get a lock out by adding water, just make sure your PH is in range and your golden! Good luck happy growing! 😁🌱