I just switched my strings to d'addarios on my Kramer, and the wound strings are giving fret buzz from around the 10th fret up. I am wondering if the problem is the ends of the strings.

At the end of the wound strings,the string tapers off to a thinner width. I don't cut off the ball ends for my FR, I just put the string in backwards, and cut the ball end off with any excess string at the tuning machine, so the tapered off part is what is going into the clamps. Could this be the problem? I already tried raising the action, and it's only on the wound strings, so it makes some sense, I just don't understand why.
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Epiphone something or other acoustic