Those TI flatwounds sounded like what I should try as my first experiment with non-factory strings until I just read a bunch of reviews that describe them as being very low tension and "like spaghetti noodles". I'm afraid I'll be buzzing all over the place if I try such soft strings on a five string. I shudder at what that B string would be like. Is there any such thing a flexible flatwound that isn't low tension?
TI's 136 B is a very good B.