I've got a 2" Jeep poly spacer located on top of my rear coil of my XL7. I've added a 2" aluminum bump stop spacer to the axle. Once you added a spacer to the coil, your bump stop is that much farther away from being used properly. With my new tires, I think the 2" bump stop is a little too short. I've got a 2" overall taller tire and so interference is a strong possibility.
For the front, this is a different story. My coil is compressed to ~8.5" installed. Free height, it expands to 12-3/4". The a-arm doesn't swing down far enough to be able to place spacer above coil and bring back up. I think I've come up with a solution of using short length rigid coil compressor sort of thing. Then, you'll have to either add new EMU?? struts up front or relocate the upper mount down. The stock struts will be at/near maximum extension with the spacers installed.
As for the angle on the cv's, the 2" spacer for up front is really pushing the maximum angle once the droop is positioned to be near stock droop from static stance. Not only will you have to be concerned of the cv's at droop, but also the steering arms as they are part of the rack and pinion steering. There will be a constant angle on these misaligned items.
Hope this helps.