You're always going have this problem with low pro, run-flats tires, that's just because by nature, this tire already has very little cushion and the run-flat material structure are very hard, a bad combo all around.. I had a bubble on both of those same Pirelli all season tires, a week after I took delivery. One afternoon, I posted the remaining two good tires on EBay for $100 each. Sold them in a half hour.
I then ordered some Michelin Super Sports from Tire Rack, who threw in free road hazard and there where no sales tax.
In two years since, I had not have any tire issues or reasons to use the road hazard. Do yourself a favor and get rid of those run-flats. The vehicle's Onboard system immediately warns you if their is an issue with any of the wheels and BMW gives you free flatbed towing for 4 years, with the ability for them to track your exact location from the vehicle's SOS GPS system. You'll survive if you decide to ditch the run-flats.
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