I have also posted a thread and pictures of my previous setup, with the conical washer installed. You can clearly see that there's two washers stacked.....
You can see it by taking off the wheel and lifting the car up on jacks.
If that's not your issue, then it's probably the end-links.
'08 AW E90 335i
PROcede V5 | BMS DCI | RR DPs | ETS FMIC | FORGE DVs | Stett CP | Vanguard | PSS10