You did indeed correct the original problem by replacing the accumulators (air-cells you called them) but the damage had already been done and you need to replace the upper bushings on the struts. They are inexpensive ($35?) plus labor.

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold