Re stiffer springs: You are reducing the shock in one direction, and increasing the shock in the other. The gun is designed for the slide to stop abuptly at the rear of its travel (the "shock" to which you refer), but it is not designed to slam shut faster/harder, which is what you are doing by going to a higher-rate spring.
Most competition shooters use recoil springs that are LIGHTER than stock, especially in those calibers that loaded way down to reach power factor.
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