My XD SC 9mm 3.0" (gen 1) eats everything and never has had an issue. I have had it for over 10 years and easily put 1000's of rounds and many various types of factory ammo. It's been my EDC on and off for the same amount of time. I know a few other friends and range buddies over the years that have the same one and always have the same good comments. Sounds like you got a odd duck. Have you tried to send it back to SA and have them check it out and work on it? I did that with an XDm a few years back that I had similar issues and they resolved it pretty quickly and did it under warranty. Hope you can work it out, it's a great firearm once its reliable and trustworthy. Good Luck.