Some observations:
Nice research. I can see that all pools have a high fees and there is no pool, which encourages it's users for optimal voting behavior by providing carrot and stick. There is a space to grow.
I pumped my fees, too, for a simple reason: competition.
It burns 1000 Coins to be a validator. Validators, that get their 1000 coins back, fast, get into a position, where they can lower the fees dramatically. So for earning back the 1000, I have to keep the fees up a bit, but my validator is no longer attractive... so for now, I keep the fees a bit higher, get the 1000 coins back and will lower the fees to a low amount