nice progress! On my truck I never had problems with the rubbing the backside of the frame. My truck always rubbed on the swaybar and front of the frame.
I was thinking the same thing when I installed the wheels on my Blazer without the tires. I have yet to touch the brake line in the real world.
if you aren't rubbing tire there, your tires aren't wide enough relocate the line so you can fit a fatter tire!