I'm using Humboldt Master A + B. This is my second try with Humboldt after using it once years ago. I was successful then, and satisfied again so far this time with 4 different strains on board. The only concern I have for one part nutes is the tendency of stuff to"fall out" of the solution. All that being said, Humboldt makes great products, and I've also heard that oneness is a great product as well. What is your motivation for using one-part, if I may ask?