Heat shields are good.
I have a high pressure regulator for my double jet burner. Lots of BTU’s, but the biggest differences in terms of speed of melting, maintaining temp, and propane conservation when using my 250# capacity processing pot were gained with a thermal jacket around the pot ala Cosmic_Charlie and a wind screen below it as per Buckdane.
https://castboolits.gunloads.com/att...1&d=1538985277