I seem to always have a slight vibration or bounce on the rear end of my 2019 RDX Tech Pkg, AWD.
I have a set of new Bridgestone Weatherpeak tires that have been balanced and re-balance, rotated and nothing seems to fix it. I still feel this vibration in the back of the seat as I drive at about 70mph.
None of wheels or tires are not out of round.

I'm beginning to suspect one of the struts in the back may be bad. They supposedly have an "Active Damper System" rather than just a straight McPerson Strut.

I'm trying to figure out how to narrow it down to what can be causing the problem.
Any suggestions?

Mike