Try the yodave kit.
I have done 4 CZ rifles. Three 452s and one 455 with the yodave kit. IIRC the kit is $8 and if you luck out with shim sizes you can do two rifles with one kit. You can remove the creep and get any pull weight you want. Ensure your rifle passes the bump test as it is possible to shim out too much sear engagement.
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