From my experience in getting my rims balanced correctly over the course of a few months, which included a Hunter GSP9700 machine, it is a delicate process - especially because the road-feel on BMWs are high. Did the hunter machine spin it faster than 25mph? I had a vibration only at 70mph+. Of course even my bad rims balanced out at zero going 25mph... I didn't feel any vibration around town. No machine did it at 75mph from what I saw. After I got new tires and good rims, it still vibrated a bit. He had used clip-ons on the inside of the rim... but you may guess that it doesn't help with any outside imbalances... I brought it back and had them use the sticky strips and now it's near-perfect. The strips are too small for me to read all the weights all around so I can't tell you how much weight was put on mine.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr