305/30/20 tire?

Anyone upgrade to a 305/30/20 tire (or wider)? I'm really sick of the M5 having VERY LITTLE traction driving around town especially when you blip the throttle. I think the stock 295/30/20s are far too thin for a 4300lbs car... Ironically I raced an CLS63 AMG the other day and both of us got side-ways on the freeway onramp - I would have taken him easily in my other cars (4wd)... :lol:



And it's very strange my old E55 didn't have these traction problems either (despite 500ft/lbs of torque).



Any thoughts?