Upgrading rear struts

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2020 CX5 AWD
The rear end of my car wallows and sways over jousts and transitional surfaces like if your on an fwy speed curve or on-off ramp ramp or changing direction, like dodging something as if the rear is underdamped. Has anyone had success with paired the OE rear coils with bilstein 4600 rear shock?

If anyone knows of a supplier that offers a OE ride height coil with a higher spring rate that i could pair with the bilsteins that would be cool..
 
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