RE: steer straight
Alot of the the Torque steer is what is often referred to "diff unloading" this is caused by A) the center diff unloading B) the rear diff unloading or C) both in sequence. You see in situation "C" if the Rear diff is unloading and sending all the torque to the Center diff then the center will unload to the front which will cause the torque steer problem. As JPKII had stated in his post the only thing to do is experiment with different fluid weights in your rear and center diffs to keep them from unloading onto the front, a center diff lock will only highlight the matter if the rear is unloading first. You can adjust the cambers and the toe but this will only mildly change/cover the problem and lead to premature tire wear. So experiment a little and go with what works best for you, you like to run on the streets and the factory settings aren't really meant for that, on a loose or loamy track the torque steer isn't really noticble and the handling is good. Just find what works on asphalt and share your findings here and the others can do the same with different settings and I am almost sure you will find the perfect setting. Good luck and I hope this helps.