I don't believe that the follower coming into contact with the bottom of the feed ramp is the problem. I believe that the feed ramp slamming into the front of the follower during recoil is what's causing the followers to break. There's an old saying in the gunsmith's book of care and repair. "If it ain't broke don't fix it." Unless you are a certified gunsmith don't start grinding on the barrel. The barrel costs over $100 to replace. You can buy one hell of a lot of plastic followers for the price of a barrel. If you break more than one follower Kahr will rework your barrel for free and you won't have to worry about voiding your warranty.
Never trust anyone who doesn't trust you to own a gun.
Life Member - NRA
Colt Gold Cup 70 series
Colt Woodsman
Ruger Mark III .22-45
Kahr CM9
Kahr P380