I have on blizzaks on my 535xi and my experience couldn't be anymore opposite compared to yours. My car is lowered on ACS springs and has the 19" M351's too.
Car felt like a tank and the traction control barely went off. Obviously if you are hooning around with the throttle the car will lose traction.
2014 LCI 550i M Sport | 3D Design Front Spoiler | BMW Performance Black Grills | BMW Performance Trunk Lip | BMW Performance Diffuser | Painted Reflectors | Wincos 30% Tint | Supersprint Exhaust | ACSSprings | MORR VS8.2 Rims 20x10R and 20x9F | Michelin PSS Tires |||More Photos of my car here|||