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They are not. As long as your rifle isn't a piece of shit, it will work just fine with steel cased ammo.
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I know ar's are picky about steel ammo,
When troubleshooting, start with the lowest common denominator; in this case, the extractor. Get a new extractor with a black insert and a quality spring.
Woah dude, some rifles ARE picky about steel case, it has NOTHING to do with 'being a piece of shit'. For instance, LMT is specifically made with a smaller diameter gas hole drilled so that it functions with high powered ammo. My LMT SBR will NOT function reliably with Tula ammo, however will run wolf okay, and anything brass does fine.
As for the OP. Before you spend all kind of money on different parts,
try a different ammo. Tula is the lowest powered ammo out there, buy a single box of brass cased ammo, or even try Wolf, and see if you have the problem. Because you are using a low powered ammo, AND running an H buffer, I do not think your bolt carrier is traveling all the way to the rear, henceforth why the round will not extract. However, it travels just far enough for the second round to move up, and jam.
To reiterate; spend 10 dollars on a walmart box of .223, it doesn't have to be federal 855 or 193, but anything that is brass and packs more of a punch than Tula. I believe this will fix your problems, if it does, great! you just saved yourself money for buying extra parts (which you should buy later anyway) but you also diagnosed your problem.