I'd stick with the .135 for the B string (I prefer the feel of a .130 myself for a Warwick B).
I love Ken Smith Rockmaster strings, they sound and feel good, last ages, and are cheap ($20)! You could go a 4 string set for the higher 4 strings, such as the SM-XL Slap Master-Extra Light, which is .040, .060, .075, .095....that's about a .005-.010 drop overall from standard, which should probably work for (B)-F#-B-E-A. There's lighter ones too, also the same in 5 string sets, but those have a .120 which is a bit too loose for a B imo.
http://www.kensmithbasses.com/Strings/stainlessteel.html
Thanks guys, I'm glad someone understands what I'm going for here. I might get a 4 string set of super or extra slinkys and run a 135 top. I wish I could find a tension calculator for bass so I could figure out what sizes I would need to retain standard tension.
http://www.kensmithbasses.com/Strings/stainlessteelmulti.html