My experience with Kimbers has been much like my experience with Wilson Combat 1911's, or STI's - tight pistols require tight ammo specs. Tweak the load to fit the pistol or tweak the pistol to fit the loads, but either way, Kimbers will run like a top once you find what they like to eat.

Put regular unleaded in a Ferrari and you wouldn't be surprised if it misfires. Run WWB in a Kimber - why should you be surprised that it hangs up on the bulged cases?