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Are you careful to catch non-mag on the way up and never let it go past that point? In other words, you can't let it go past and then try to cool it down to non-mag and quench. Other than that possibility your process seems OK except for the moving in oil for 15 seconds - let it stay in the oil until it has cooled to the point where it is merely warm to the touch. Any variation in the results should be dependent on how closely you are able to replicate the exact process each time. For example, if the forge is much hotter one time than another then you might still be catching non-mag just fine but that last 20 seconds could over heat the steel if the forge is hotter than usual. Or, as I indicated above, if you pull it out of the oil before the transformation has finished....
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