So I've been having an old set (approx 10 years old) of Labella flat wounds on my '71 which have served me pretty well over the years, but recently I've found the E-string to sound way more dusty than all the other strings. A, D and G are fine, E sounds like it's lost all life. Is this a known thing for LaBella? I really want to replace the strings, thinking about getting a new set of LaBellas but if this is the case with the next set too... Might switch to Thomastik.