Rodney, a basic start for positioning the mains is to have them separated by about as much as your distance from them, so if anything you might separate yours a little more than they are now. Then, they generally should be toed-in enough to have the tweeters pointing at your ears. Small adjustments from that basic position can be tried to see if it sounds even better.
There's no difference in the positioning for two-channel music, and you should make use of all your speakers for that by applying DPLII or Neo:6 to extract the reflected sound that originally came from directions other than the front and send it to the surrounds where it belongs.
