Weston: I'm not familar with the S&W 1911's but I'm guessing it has a rail for attachment purposes and thats wherwe your problem is coming into play, I have a 3" 1911 W/Rail and it took me some time to find what I wanted but I finally had Eric Larsen at HBE Leatherworks make me a Com 3 IWB for it and I havent looked back.
Try looking at the custom leather makers out there, there are a lot of them and see if some friends have some different ones you could try on even if it's for a different gun than yours you will get a idea of what you like as what works for 1 person may be awful for the next. Good Luck after 35 years of carrying I have it narrowed down to 5 guns and 5 different holster designs.