I recently put Chromes on my L-2500 as well, in part due to @twinjet's input. I just got the bass back from the luthier about a week or so ago, but so far I think those strings gave me exactly what I wanted out of them.Got the D'Addario Chromes. Wow, they are smooth feeling, something different for my fingers. Plugging in for a few minutes and they sounded good.
Maybe just my ears, but the tone I like best is Series -- top switch towards strings, and Active Boost (?) -- bottom switch toward strings. Treble turned mostly down, and Bass mostly up.
The great Ed Friedland on his Facebook said you'd be in deep doo doo to be using the Active Boost on with the L-1500. And he said the Passive tone is great. Nevertheless, I believe I'm liking the Active Boost mode.
Thx, Joe
Series/Active definitely gives you some beefy tone, too!