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I upgraded to 22's, and had similar experiences. The bigger wheels weighed quite a bit more, and it did take longer to accelerate and BRAKE for my 3.0i. The reduction in braking performance was the most upsetting part, purchased a used 4.8is calipers for the front, and then ended up doing a BBK instead and the brakes feel better than the factory with regular sized wheels.
Also, as mentioned RF's are just horrible, very heavy, don't handle potholes/hard surfaces well. I switched out RF's for cobventional tires on my F10 550i, and it was the best upgrade I did.
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2001 Topaz Blue X5 3.0i Current 2017-
Aftermarket: Dinan Tunes/Camber Plates/Strutbar, KW coilovers, 22" ACS wheels, Eibach F+R swaybars, Thayer Camber+Toe bars, Stoptech F+R BBK, Audison/JL Audio/Critical Mass Audio, Eisenmann Exhaust
OEM: LCI Conversion, Running Boards, Euro Headlights, Lemans flares, 4.8IS F+R bumpers w/ flares, 20" Style 214 wheels, Imola Red interior retrofit, LCI Heated Wheel
2002 Topaz Blue X5 3.0i Retired 2002-2010
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