Coconut flour really does suck up moisture, like @nancyhernandez said about her hockey puck muffins. Try using way more wet stuff than you think you need for banana bread.

Come on, sometimes you just gotta trust the process and get the job done. Bosses have the big picture, right? I've seen a dozen quick fixes that lasted years without a problem. Holding everything up for one iffy spot can cost more in downtime than the repair ever would. You got lucky this time, but playing it too safe every time just kills efficiency.