Hmmm. I'm going a little bit offa' memory, because it's been a while since I changed strings, but the (low) B-string in a set of T-I Jazz Flats is .136 or something crazy. I have on experimental basis, used D'Addario Chromes, which (again, been a while...) had a .132 B-string. There must be something different with that string manfacturer, and if a little crimp in the windings down there gets you home, then I wouldn't worry about it too much.