I finally got around to trying these....just put a set of 11s on my Dupont and they sound and feel great. We'll see how they do over time....but my first impressions are stellar.
I also just added some bulk pricing for these:
D'Addario
Gypsy Strings Bulk Discount
Comments
How are the strings holding up?
I just noticed that the d'addario light gypsy strings produce an uneven tension on the guitar's neck (contrary to the d'addario silk and steel ones)....Is it possible that this issue will eventually lead to a twisted neck? I didn't have the chance to check on other types of strings (couldn't find tension measurements....) to see if this is a typical case or not....I am not an expert in this things, but i think that a good compensation would be to use the d'addario 011 for the high E and B strings...
Edit** OK, I see where you're getting this info - written by the strings on the webpage. This isn't a big imbalance. The wound strings are almost always heavier than the plain & the G string is characteristically high in tension. I don't see this as a problem if the neck is built well but if you're concerned - contact the maker of your guitar for a second opinion. Strings with this tension profile actually will feel pretty balanced. I tried a truly balanced set of strings once and it felt really really odd... like the high E and B strings were too tight and the G string had no oomph at all and just squished all over the place and buzzed.
But the point of all of this is that it's good you're thinking of torsion - but strings are the least of your worries with respect to torsion... the way the neck was made is the big issue. If you buy a 1 piece neck that was carved green by a CNC machine and fitted with a truss rod which was cranked hard to overcome the movement in the neck wood... you have a whole bunch of pent up tension in the neck which can't relieve itself by bowing so it manifests itself in the only ways it can... waves, humps, twists etc.
However, a caution about string size and string tension. It actually is pretty darned important because truss rods aren't really the panacea they're built up to be. As you said, they don't protect against torsion. In fact, they can add to it if they're used improperly to overcome stability flaws in the neck (as described above) If the wood wants to move, and the truss rod is holding it in one plane between the 1st and 12th frets - you know that tension will come out somewhere else... usually by twisting or waving. But independent of this battle of forces occuring inside the neck - a person adds string pressure. The difference in pressure on the neck between one set of strings and another is not all that great because the neck is (hopefully) a very strong structure... What you really need to be concerned with is all the stuff that attaches to the neck on both its ends. That's where your string choice really affects a guitar's health.
Stiff strings put a lever force on the headstock proportional to the angle of the headsock. They also stress the neck joint which is a near 90 degree angle. They also stress the primary structural braces on the neck side of the soundhole and the rims near the waist of the guitar which support those braces. Those places are where you really hurt a guitar through overloading it. Although the classic neck banana seems to be the most feared outcome of heavy strings - it's much less common than cracks along side the fingerboard - and neck resets - and sunken tops - and snapped headstocks - and fingerboard replacements. A neck is a neck - it's a big friggin piece of wood that hopefully is built well and full of structural support - but the delicate structure to which it is attached .... that's where your 3.5lb gypsy guitar really differs from your 5.5lb dreadnought or your 6.5lb archtop. I can rummage around and look for some pictures to show you what I'm talking about, but that's the basic principle. If the neck is made well - the torsion difference of a couple dozen grams is not an issue. Hope that helps.