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Don't put it into the tempering oven while the blade is still hot. You may not be giving the steel long enough to convert to martensite and you'll end up with elevated retained austenite. Wait until you can hold the blade in your bare hand without too much discomfort. The temperature of the kiln and the soak time are probably good as you need most of that time for the steel to come up to temperature.. I would back the tempering cycles down to 375? unless you are making a chopper. A slicing blade could use the extra hardness. I think that the consensus is that you put blades into a preheated oven.
Doug
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