My FLs are on a Precision and I'm trying to give them a chance. I had them on only about two weeks when I took them to rehearsal and the band hated them -- too thin and middy.
That was about 4 weeks ago. I've been playing them a few days each week since and I've noticed they have improved. I'll try them with the band again in a few weeks, and if they haven't improved enough by then I may ditch them for the FS set I've got sitting here waiting for its turn.
Are you playing the tone wide open or rolled back? Roll back the tone some. And I am using a 0.1uF cap which I think also helps.

