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Yes it is certainly possible to go over 62.
I've made things in SC145 which is pure steel with 1.45% carbon.
Water quench that and the Rockwell C hardness is going to be 65 or so. Completely...

Great discussion btw.
My experience is that warp is caused most commonly by not enough normalisation or not holding the blade straight during the quench so one side cools faster.

Also gently...

On my phone so short answer.
Laminating with lower carbon steel makes it harder not easier to keep things straight because both sides will not be identical. Additionally the piece may just tear...