Daewoo,
You are a little off base with your comments about slide to frame fitment. I've been building 1911's for 35 years and worked for Colt for a few of them. A properly fitted slide to frame is just as reliable as one that sounds like a baby rattle, maybe even more so. You are, however, correct about the relationship of slide to frame only providing a slight increase in accuracy, as long as the barrel is fitted in such a manner that the verticle "slop" , is removed. The problem is, a pistol fiited in such a manner will not shoot well for very long. Proper slide to frame fit is very important for the longevity of an accurate pistol. Verticle and lateral play in this fitment causes a tremendous amount of wasted energy during slide movement and increases wear significantly. Frame to slide fitting is extremely important in a properly built pistol and should not be overlooked.
For many years I used the rail peening method to obtain this fit but found there were many guns that had such bad fits to start with, a proper fit was not always obtainable. I now Tig weld almost all of them and remachine them. I still use the 3.5 nickle-mild steel rod available from Brownells, and have found nothing better. I have probably done over 100 guns this way and have never had a return for any issues---at least for the welding part of it.
submoa