My FA just kind of went away after dragging a bunch of the floating mats out of the water. My pond edge looks just about like yours with just a slight amount of residual FA around the edges in places.
Did anyone tell you most people put the fixed portion of the floating dock where it is attached to the bank ABOVE water?

Sorry, just being a smart ass........ couldn't resist.

If that is a groundwater pond, you obviously have had adequate rain to recharge the aquifer.
Like your rock lining around the pond. Pretty much what I did.