the steering/braking issue are DIRECTLY related. Its called bumpsteer. I had it. Lots of other people had it. When you step on the brakes, the front springs compress and if there is any angle on the drag link, it either forces the truck to turn right or the steering wheel to go left. I got used to compensating for it, but X-over is well worth it.
And yeah, you are gonna have to have something custom fabbed for the sway bar to run crossover, but even when i ran 6" TC springs (2nd softest off the shelf, next to BDS) i never had a sway problem. Its not a race car and should be driven accordingly.