Stress relief for 15N20 - will it help with warping issues?

I just finished a blade in AEB-L and didn't have any issues. Maybe because it was such a small blade 3.5" hidden tang.
 
I just finished 4 AEB-L 7 1/2" hidden tang blades with steel from AKS, no warp problems at all. Plate quenched (hand held, no clamp), clamped in Cryo tank and clamped in tempering oven. I kinda expected a problem, but they came out straight. Also, did not normalize, soaked at 1560, austenitized at 1975.
 
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