With all due respect Pat, I find it hard to believe oil does what you say it does. I never, ever scorch the wood without oil while making a correction, not even a tiny bit. Won't do that to my bows. The heat is distributed evenly by the way I run the gun and only needs retained until the bend is made, which is often also when I shut the gun off.... sometimes I'm making the bend as I'm running the gun. Depends.
It's all good. I don't care if everyone but me greases their bows up, I'll never do it, or advocate it. My experience has shown me too many times that it's unnecessary.