Welcome to the forum. The extended grip safety helps to the extent that it allows some flexibility in the hands of folks of different sizes and in how they hold the weapon. In the past there have been issues with 1911's that have a grip safety of the style your Kimber has. People would try to fire and it wouldn't discharge until they adjusted their grip. I have both styles on various weapons and have had no problems either in grip or the safety bothering my palm. I haven't looked on-line but I'm sure there are options for you to swap the safety to one more to your liking.