If you go with 275/35/19 in the rear, I really doubt you will rub.
Here's a thread with some pics of a F10 with OEM 19" 351M wheels running 18mm spacers all around and dropped on H&R sport springs.
That's makes it 19x9 ET26 275/35/19 in the rear.
http://f10.5post.com/forums/showthre...mm+351m&page=2