Ohh. I think this is a really pretty aquarium you have here --very artsy. The Echinodorus bleheri sword plant is clearly the anchor of this layout, around which all else is organized. Personally, I would continue trying to enhance the type of layout you have already created instead of changing it drastically.
It may be time for the Hygrophila polysperma 'Sunset' to go, perhaps replaced by a more controllable, less ratty stem plant such as Heteranthera zosterifolia, Hemianthus micranthemoides, Micranthemum umbrosum, or Bacopa australis.
You may want to try incorporating more visible rock wood work into the layout.