If you already have a setup, I can't think of anything you don't already know.
Jim, I wish I did, but I always find something I never knew, and learn every day.
The heat saving trick I came up with, uses ceramic pads under under the four corners of each heated tank. They keep the heat from being leeched into the frame. I am looking at a few new ways to make them better. I have seen folks add heat shields around the outside, but I don't know if that actually helps that much, as long as the heat from the bottoms are directed up around the sides. The main thing is getting the most bang for the buck out of two 10 lb. propane cylinders.
The rinse tanks, I modify by adding drains, and have a cold water spigot mounted to fill them with. I do my hot water bluing on a separate portable stand.