I use FF products, but I don’t do the scheduled flushes. The only time I flush is to correct pH or PPM, or a flush before the harvest to rid the soil of most of its nutes. I’ve never used a flushing agent either. Plain old distilled water runs PPMs down pretty quickly on its own.
Ironically, the flushes I’ve done line up pretty well with what FF has in this chart.
I only use Big Bloom, Grow Big, Tiger Bloom, and some kelp. I don’t mess with the rest of the stuff. Maybe some cal-mag here and there, but I use it pretty sparingly. I use someone else’s microbe product for trace elements. I use it very sparingly too. Can’t remember who makes it. I go much lighter than FF calls for on their schedule. Usually half.