Indeed - everything on the right side of my body is physically backsliding, and eventually will quit. My right leg is essentially done, and my right arm is about 55% with my hand being more like 40%. I have to shove a pick into my hand with a huge amount of friction tape in order to play. But I contend that EVERYONE is handicapped; my version is just more obvious than most everyone else's.
Not only am I "feel specific", I'm "tone specific" - the rougher steel strings are a drag (get it?), and since I use the aforementioned abominable pick and I DON'T play metal, I try to stay away from the brighter strings anyway. (Easier on frets too - bonus!) I'm hoping your experience and return to the Dingwalls foreshadows my own, but if I were a betting man, I'd lay even odds.
A quick search of the intrawebs has yielded exactly zero nickel strings with a .120 gauge and a 38" speaking length. I don't mind D'Addario XLs as they suit the styles I'm playing these days, and if I were to buy single strings, the A, D, and G could be standard scale, and I could get a .095 Super Long Scale, but nobody seems to make (due to lack of demand I'm sure) a .120 nickel B.