nutrient lockout is not due to the brand of
nutrients you use. Nutrient lockout is due to two things,
1. improper pH,
2. mixing them incorrectly. And by that I mean combining parts together (A and B etc..) at to high of a concentrations. If you mix them in the full volume of water you intend to use, that will never happen.
HOW ARE YOU TESTING YOUR pH now???
If you choose to use the same pH drops you were using, you will never be able to get your pH correct. I'm just trying to save you time, money, effort, and frustration. But I'm wasting my time if I don't know the basics.......