Re: Loops unwinding...
I haven't had D'Addario J-74's unwind, but I had 4 loops snap during the previous restring. I've changed the strings several times before, and this package was the only one that has had any problems. It was both the "A" and "E" strings in that batch. They weren't even up to pitch when they snapped, so it wqsn't overtightening. The hooks had no sharp edges, so all I can figure is that the loops were bad from the factory.
"Put your hands to the wood
Touch the music put there by the summer sun and wind
The rhythms of the rain, locked within the rings
And let your fingers find The Music in the Wood."
Joe Grant and Al Parrish (chorus from The Music in the Wood)