Long story short, I have been CDing (now with 2 kids) for almost 2 years with an HE machine and soft water. We moved about 3 months back, got a new HE washer (newer version of our 2 year old Whirlpool, so no new features) and have mildly hard water. We had zero issues before we moved with a cold rinse, hot wash, cold rinse.
I have tried everything, and our diapers just stink with the dreaded barn stink after every wash. We bought a few new diapers when we moved, and they stink as well, so I know it's the wash routine here. So far I have tried Stripping with RLR, Dawn, calgon; New detergents (tinny bubbles, Rockin green and Nelly's); changing the amount of detergent; washing daily; adding a wet towel to get more water; sunning with every wash.
Any other suggestions? I cannot boil since everything is an AIO. I have natural and synthetic fiber diapers.
Re: The "barn" stink
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I have a HE machine and extremely hard water. I got rid of all microfiber inserts and now have only hemp and cotton inserts (I think they hold less stink). I do a cold quick cycle with added bac-out and usually try to stop the machine and let it soak for an hour or so. Then I do a hot superwash, then a hot rinse cycle. I also upped my detergent and switched to Planet detergent. We finally do not have the barnyard stink anymore. Good luck!
Oh, I also try to rinse inserts before I throw them in the pail.