Kimber Custom Series 1.  Purchased used with a minimal round count.  Appears untinkered with; all factory parts.  Feeds perfectly, but I've had 3 identical malfunctions in 200 rds.  Ejected round jams lengthwise into the barrel hood while feeding the next round.  I checked extractor tension and it looks good.  I have noticed, however that the craptastic MIM firing pin stop is so loose that the extractor can rotate easily (a couple degrees) in the extractor tunnel.  

Correct me if I'm wrong, but isn't a loose firing pin stop one cause of erratic ejection?

See my post below:

Yes, it can be. If the extractor is allowed to rotate (Clock) or move with too much play, for and aft, you can see problems. I recommend either fitting a new Wilson bulletproof stop or an EGW square stop. The EGW will require more fitting and it also does not have a radius at the base. Many people, including me, use this part. You will need to evenly break the edge (Slightly round). The Wilson will just require you to fit the sides to achieve a drop in fit. It comes with instructions and is easy.

EGW firing pin stops are great!  I highly recommend them.

Hopefully, that will straighten your problems out.

Thanks so much for the EGW recommendation.  I actually first bought an Ed Brown "over size" firing pin stop, which wasn't.  Too small to fit properly.  I then purchased the EGW part.  It took more than a hour to fit it to the slide and extractor. The bevel turned out well.  

Test fired yesterday.  Ejection is now strong and consistent.  

I have had the exact same issue with my series one Kimber Gold Combat Stainless. It seems to be a common problem with them for some reason. The gun is top notch otherwise though. I am glad that it all worked out for you.