I’m not familiar with Kimber 1911’s. How long of a barrel do you have there? I love Commander sized 1911’s and own several. I run a 20# recoil spring in mine as recommended by Ed Brown. One put over 8,000 rounds through one of my Browns with not one failure. To the point, none of my 3 Commander sized 1911’s (two in 45 acp and 1 in 38 super) eject spent shells in what I consider a normal, consistent pattern. They all will eject anywhere from 1 o’clock, to hitting me in the face. I do believe your recoil spring is too heavy if you have a Commander size pistol. That would explain the short distance your spent shells are being ejected. I guess what I’m saying is that 1911 pistols shorter than a government model may not eject shells as consistent as other pistols .