I have a set of Fender flats on my Jazz Bass and they don't sound like the flatwound sound I have in my mind. It may be that, since they've only been on my bass a day, they have some mellowing out to do, but they're a bit bright and harsh sounding. How do the Fender flats compare to Labella Deep Talkin' flats in tone? Will these Fender's mellow out into old school flats tone? My Jazz has a J-Retro on it - does that matter?