1) May need to clarify, although the rr is nearly unchanged the gap will look larger, it's more of an illusion. Trust me, when I changed my e46 to wider rubber with same rr as stock the gap looked larger.
2) 19" stock rears are 265/35
3) Good luck with springs but I think it might cost you a few bucks over the long hall for new EDC suspension components. Springs may do Ok for garage queen cars but not daily drivers. The physics will catch up with you eventually. Time will tell I guess....
2009 E92 M3 | Alpine White | Black Novillo Leather | CF trim | M-DCT | Heated Seats| PDC | iPOD
Modifications| KW v3 | 19" BBS LM Champion Edition |Matte Grill |Clear Bra |50% tint | Painted Reflectors