Have you looked into solid upper or lower mounts like Turner Motorsport Spherical Rear Upper Shock Mounts - E9x E8x non-M ?
https://www.turnermotorsport.com/p-5...-shock-mounts/
or Turner Monoball Race Lower Rear Shock Mount - Pair - E88, E82, E9X?
https://www.turnermotorsport.com/p-5...r-shock-mount/
Would be interesting to know some science instead of just the marketing hype available. Thanks for all the great info and compelling threads.