Point-N-Shoot
(I tried to make this a reply to your PM, but this is too long.)
Are you using Fiocchi, or European, or +P ammo? If you are, switch to ammo from a US compnany, or to standard velocity ammo.
Your description reminded me of a situation I had when using Fiocchi ammo in a pistol from another manufacturer. In this instance my firing pin was getting stuck forward also. Based on your description, remove the slide and barrel from your frame and set aside the barrel and bushing. Now look directly at the breech face from the front of the slide (like you were looking down the barrel). Do you see any damage (dents or raised/moved metal) around the firing pin hole? If you do, don't bother with a new spring, or other parts, and send your pistol back to Kimber. If you do not see any damage go ahead with your plans to change the parts, but keep an eye on the breech face every time you clean your pistol. Also take a look at your expended brass to see if the raised surfaces on the primers are getting any bigger. If they are, stop shooting and send your pistol back to Kimber.
Since the firning pin strike is within 1/2 diameter of the primer center this should be okay, and you should not have problems with ammo not discharging when you pull the trigger. Though your description of the raised metal around the firing pin strike mark is something to be concerned about. Which is why I asked you to remove the slide and barrel to look at the breech face. The raised metal on the primer is known as "Primer Flow" and most US ammo manufacturers use "hard" primers to prevent this from happening. While this appears to be an ammo issue, it really is indicating a problem with the barrel. From my experience there are two causes of primer flow, the barrel link is not the proper length (its too long or too short), or the barrel is not "timed" properly, the lower barrel lugs are not shapped properly letting the barrel cam down during recoil too soon. In either situation, the case and the primer are not properly supported flush against the breech face during the pressure spike caused by the burning powder. Because of this, the rising pressure (up to 36,000 psi in a 9mm Luger) causes the primer metal to "flow" around the firing pin and fill the gap between the rear of the case and the breech face. This "flowing" primer metal can put quite a bit of side force on the firing pin, plus when it hits the breech face during the ejection process, the pressure in the case will make the raised metal "hard" enough to hammer the metal in the breech face next to the firing pin hole. In my case this situation displaced the metal around the fining pin hole into the hole, so the firing pin would get wedged into the now smaller sized (and no longer round) hole.
If this is your situation, return your pistol to Kimber, as at the very least your barrel link will need to be replaced, or the barrel may need to be replaced if the lower lugs are not shapped properly. Plus, depending on if, or how badly the breech face is damaged, the slide may need to be replaced.
I hope this helps.
Str8_Shot