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I've been heating my oil in a double boiler set up and using a candy thermometer. The double boiler works well in that I can also easily cool the oil with a bath of cool water if I get it too warm.

I agree. After I posted I was thinking that this is not really the same thing as quench cracking in a single alloy steel. It still makes sense to make the tail end of the quench as gentle as possible...

After reading about martempering, it seems that the speed from 220 C down to 100 C is where you want to slow things down to reduce stress. The temp of the oil would have a huge effect on the rate of...