jibs,
I use pK for about a week. I then cut my base nutes by 50% and begin with moab.I run mostly 10-11 week strains , so I run moab for about 3 weeks or so depending on how the plants look. Then I reduce my nutes to just plain water over the next week and just plain water until they are done . I have been doing my feeds this way for about 15 years and the only time I have had any problems is when I did not reduce my base nutes enough .