I wouldn't get rid of those frags. Like you said, those shouldn't be on the AEFWs menu. I would still check them for pests just in case.
How is the FF digi looking and growing? That one was one of the first to settle in for me and start growing. Even while others perished, that piece didn't flinch.
Perhaps an ICP test if you've never done one. Might find something, might not. Worth the piece of mind, imo. Especially if you can't pin point a problem.
Just some thoughts. Really want to see you pull through this.