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If you think that the quenchant is not of an even temperature throughout then it would make sense to stir it before quenching.
Looking at the information from the link that you posted to get you hardness down to give a good balance between edge holding and sharpenability I would go to a tempering temp of 300° C which I imagine is above what can be obtained in a kitchen oven. One more reason to heat treat this alloy in a regulated high temperature oven.
Doug
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