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My goal is to make it through a case of shotshell with no malfunctions…
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With quality shells and a properly maintained gun that shouldn't be a problem. Does you gun have a tight or rough chamber? It could contribute to your problems. When guns are manufactured, a new chamber reamer cuts the biggest chamber. As more guns are made, the reamer wears down and successive guns have smaller chambers. Eventually the reamer gets so small it can no longer be re-sharpened. Perhaps your gun was made just before they retired the chamber reamer.
You've probably read other posts on the problems some folks have with Remington 870 Expresses. The factory doesn't spend as much time on the Express chambers as they do on their higher cost guns. Many folks complain about the performance from their 870 Ex until they put some time into polishing the chamber.
Also, your gun can be in perfect condition; but, it may not be happy with a certain brand of shells. Again, there are numerous postings with members complaining that their gun just doesn't like a certain brand of shells. Quite often they have been using bottom dollar promotional loads from a big box store.