Check that bedding didn't get into the slot on the bottom of the action the is now causing it to sit cockeyed on the recoil lug. Thatswhat it seems like to me. Even a little flake of it wl cause you to twist the action a little if you really torque it down. It cold be torque sensitive too. In the original stock maybe the torque setting was such that the action was not stressed but now your cranking it harder and bending smething.
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