I wish I could get APW established in my pond, so I may be a bit biased. I'd let it go as far as it wants until it starts to hinder my goals for the pond. It's very easy to pull out in areas you want open, one of the best pond plants to have, competes nicely with undesirable plants, and very appealing to the eye.
Is this the pond you put the crawdads in? If so, they must not have over populated as APW seems to be a favorite food for them.
Your APW stands look great!
