Glock, it's a design flaw. They might "dick you around", but only IF you ground the blade down without giving them a chance to fix it. Unfortunately, I'd say the problem is now yours. I know that's tough, but I'm fairly sure that's how they'll view it. If they fix it without a whimper, kudos to them and good for you.
When I sent mine back, I wrote in my note that I took the knife apart, and told them why I did it. Normally, once you disassemble a knife, they disclaim the warranty (I know for a fact, besides my Skirmish case, they don;t hold tight to this rule). I told them I wanted to be sure I didn;t nick the blade myself and, although it appeared to be hitting the barrel spacer, I wanted to be sure. SO I took it apart and confirmed my suspicions. They had no problem with that.
Good luck with that knife. Accepting or rejecting a knife with a design flaw is one thing, but modifying the knife and then sending it in for warranty service might be another, indeed.
Good luck!