The thin washer is supposed to be wavy or "bent" looking- it allows the floating bolt head system to work as designed and it acts as a thrust washer to keep the rattle or slop out of the bolt assembly. In other words, your bolt is fine.
As far as hard- to- chamber reloads are concerned, check to make sure the bullets are seated deep enough. You mentioned that they were longer than before. They may be too long, jamming into the rifling when you try to chamber one. That may cause excessive chamber pressure which is dangerous.
Try chambering an empty case you have resized and see if that chambers easier. That will give you a clue as to what the problem might be.
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