I'm starting a new thread with a different flat wound B question. How high up the fretboard can you get before it starts to sound too inharmonic? I have tried both TI Jazz Flats (.136) and D'Addario Chromes (.132) and am finding that on a Lull 35" with P pickup, around the 10th fret it's starting to get inharmonic. Even the 8th (G) doesn't sound great compared with the C on the E string above. With rounds I can get up to 13 (C) or 15 (D) usably and with Kalium strings, even a little higher. Is this a setup issue? Should I go to a thinner flat wound B? I do like to play with some attack so don't want to go too thin. Thanks for your thoughts.