I myself have only smelted one batch of lead, but if i wasnt moving and I actually had a steady source of range scrap I would improve on my setup. I have heard many suggestions on this forum that heat up the process and save propane. I was actually going to build a type of rocket stove smelter that burned whatever you threw in the bottom like dried yard clippings branches, grass, plants etc.
For the turkey fryer setup ive heard putting a lid on yer pot and putting a water heater shell around it improves efficiency.
Please recommend another way or ways to improve effeciency, describe your setup and say what you use to flux and your pot's capacity and how much time it takes to process a full pot from cold start.