UPDATE:
I ended up going with 15mm Macht Schnell spacers for the rear, so I'll be running 19x8.5 +23 on 235/35/19, 19x9.5 +18 on 265/30-19. I am going to choose to not roll my rear fenders and just run negative camber once I get my Eibach Pro Street coilovers installed.
I'll let you know how it goes. My ideal setup for the future is to save up for some Work Brombachers and run 19x9.5 +28 up front and 19x10.5 +22 in the rear. I know I'll need to do some major fender work for that, but I'll be willing to then. In the meantime, I have to make do with what I have. Maybe I should sell my Canon 5D Mk II.