I'm still VERY new, but I'm growing in FFOF as well.
5 gal fabric / no nutes, teas or anything added - I'm new enough that I didn't even add any perlite....
I have read over and over that FFOF is a highly amended - "hot" - soil, and needs little, if any additional help.
As such, I started in FFOF with nothing added, top dressed with FFOF at week 3.5, and will be top dressing with FFOF again in a week or so.
Maaaaaaybe 1/4 strength bloom booster in 1 or 2 pots to see if it makes a noticeable difference.
Point being that FFOF growers need to be aware of how many nutes came in the bag before adding more.
My girls are all flowering nicely and I can't find a reason to screw with that.
This is a great thread on using FFOF:
This thread was created to help those who seem to overthink the ease of use of this highly ammended bag soil. I see many growers both new and experienced seem to post “ issues “ when trying to run this medium. I am merely showing a simple no frills method of container / bag grows for autos...
www.rollitup.org
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