Finally, got rid of the Bridgestone RFT's, I put on some cheap Winrun tyres. I thought anything had to be better than the Bridgestones and I was right; these cheap tyres are far better, smoth ride, good handling, quieter, no more tramlining. I have no idea how long they will last, but at less than half the price of the old tyres I don't care.
I carry a portable pump, a can of tyre repair, and am looking around for a small but capable jack and a spare for trips.
BMW should be ashamed for putting rubbish RFT's on their cars.

Mike