Serious cooking is mandatory for phono cables, especially those with DIN connectors (not your problem, luckily), because the signal is so minuscule that a phonocable NEVER gets fully burned in if used solely from cart to phonostage.
Be glad to cook yours for free (just the OP). I have the latest Audiodharma 3.5 Cable Cooker and it's been a godsend. Two-three days should do the job. Return shipping on me (assume you're in the U.S.) Morrows used to be my go-to cables.