| What you describe sounds pretty strange from here. If the outer wraps of the A string were loose, you may have a defective string, or you may have cut it wrong or something. Also, I've not seen any strings that change texture or diameter or whatever around the 12th fret. IME, D'Addario Chromes have a consistent appearance and texture and so on from nut to bridge.
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Washburn Club #11
Warwick Club #XN7
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