I really got to have more patience with breaking in flats

I have the labella flats 760 FL on my main P bass and they sound great. Also they always sounded evenly, and sorta died down pretty fast and evenly.

The 760 FS set I put on my jazz.. well that's a different story. They die very uneven. The D and G string sound almost fresh with a lot of sustain, and the E and A string.. oh my.. they sound great. Dare I say even better than the FL set? Yeah I dare. But the contrast is killing me. Almost to the point that I can't stand it. The good thing is.. I know what the reward will be when I stick with them.. Well at least that's what I hope. I will take this bass to practice more often to play the sh*t out of 'em and really get some sweat into them, see if that speed things along.

I wonder how the greats from the old day handled this. I know they only changed a string when they broke, but hell that must also be a great contrast in sound. Not really what you look for if you'd have to go and record another hit single the next day...

Any advice how to speed things up?