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Multiple tempering cycles were fashionable long before retained austenite became a discussion topic in heat treatment. There are some legendary tales that tempering pauses must be at least 24 hours...

Okay. Keep O-1 simple.

It's a simple steel despite the small amounts of alloying elements. The specifications by Carpenter, and other companies, is five minutes per inch of thickness. A razor...

I'm with Charlie about tempering. Only one cycle is necessary and O-1 tops out for hardness at about 400F. I'd recommend finding and studying TTT diagrams like this one: (down this page a bit...) ...

This thought problem is developing well. All the advice given prior to my arrival is solid. From the sound of your last post, the edge may need only to have the little decarburized steel removed...