This came straight to mind while I was reading the original post. The strings mentioned are nickel plated rounds, and some people have reactions to the nickel, making the fingertips quite sensitive. Do your fingertips go white, like you've got dead skin, when you've played for a bit?. Certainly did for me when I tried them, haven't had any issues since moving to stainless steel rounds.
Currently using D'Addario Pro Steels, which feel great to me, sound great too. Might be worth a try. Another plus side of stainless strings is that they last for ages.