Potentially down to the lack of aerodynamics - the front wheels getting 'light' which has an adverse effect on steering.
Spoilers are the only answer aftermarket of course.
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Current: F90 M5 Competition
Gone: F80 M3 Competition Pack / M135i / F15 X5 M50d / Saab 9-5 Aero HOT / F30 335d xDrive M Sport / E92 LCI 320d M Sport / E46 320d M Sport Touring / E46 318i Touring
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