Try a different brand of gasoline, but as a general matter if you're not pulling significant timing across multiple cylinders during WOT, your car is probably running pretty happy. That's a broad statement of course, but our cars are extremely sensitive with regards to timing, and bone stock E8xs that are in excellent shape will sometimes have small timing corrections. The goal is zero corrections whatsoever, but if you have small/infrequent timing correction events that arent causing misfires etc i'd estimate your car is fine.
E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII