It's a Scandinavian thing
I have an F36 but you both describe the problem I still have. Keeping in mind that the roads here in Sweden, at least the south, are terrible when it comes to noise caused by the asphalt, it's very possible that are indeed the tires and a slightly noisier car.
My car, for instance, was found to be slightly noisier already at idle and all my winter tires, delivered by the dealer, were all found uneven although balanced.
On the other hand, I was told that the noise was withing limit and the tires, although gotten via BMW, I should have claimed to the manufacturer.
I'n my case, having run flats doesn't help too.
If you can, get a new car or at least tires.
My previous BMWs were all quieter than this one although, in my opinion, they are always nosier than the other germans.
In any case, good luck!
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