Hi MD! How you bin?

Your experience, is the exact experience I've had.
This is my 3rd or 4th trip around the play pen. I've tried lots of stuff. I think the assessment is; BMW uses ATE brakes which are not as high precision as Brembos. They have movement to the calipers and the "conventional" pads. With pads that dust some, they wear nicely and have no shimmy. The no dust pads are simply not cleaning off the deposits on the rotors in good order. Rebedding the brakes every 4k to 5k is a little impractical at best, and impractical with a 3.0i litre X5 that takes a weee bit longer to get up to 60 on the bed in runs.

Like I said, this same brake part combo works great on the Z3's. One bed in, with a revisit once in a rare while and they seem to be good.

My next experiment is slotted drilled rotors.. which will clean the pads a little.. which will prevent the deposits in the first place. If that doesn't work, its back to the "medium dust" pads.. so they can keep those rotors wearing slightly!