E61 535d wheel rubbing

[dazzpowder]

Can anyon offer some advice please. I have an LCI E61 535d with the 172 Spider alloys, one of the rear wheels has been welded and I was intending on replacing it, I have the stagered fitting with 275/30/19 on the rear and 245/35/19 on fronts, problem is the rear is rubbing slightly and BMW have said it's not a standard fit also I'm now told one of the front wheels has a buckled rim not sure what BMW are talking about as I didn't get a chance to question this when I picked up the car and I don't feel any kind of wobble from the steering at speed.

So my questions is should I fit 15mm spacers to the rear and replace the welded alloy or replace both rears wth 8.5J 245/35/19

Can anyone advise I like the staggered look but would this effect the self levelling suspension or have any other detrimental effect on the mechanics could it improve handling? I have the extebded warranty which has been a god send as the car rarely goes 3 mnths without having some sort of issue and wonder if with spacers BMW could be picky should the levelling suspension fail

Thanks in advance