I hate to cross post, but ideas seem to have dried up in the Troubleshooting room, so as a last attempt I'm trying here.
I posted
this thread about pulling under braking.
We've replaced the rears, the fronts, both calipers, swapped hardware from left to right side, replaced hoses, replaced proportioning valves, cylinders, on-side control arm, and inspected just everything that was listed on the other post.
Please help a desperate man who's wife will kill him if she can't brake in a straight line !!