I believe you should have a few cars and not put all your money in just a single car and torture it with something it's not intended for. The 7er is a cruiser. It has enough power to get you out of tricky situations when needed, but it's not designed for excessive track-like driving.
When I feel like driving more aggressively I take my 5er or the S8. Hell, even the older S8 is close to sporty driving than the new f01. It weighs pretty much as the 5 series, handles a lot better better (modded sport suspension).