DR Strings Drop-Down Tuning DDT-65

I'm using these strings on a 4-string bass tuned to drop B. They are heavy as hell, and sound pretty good. The only downsides are that the low B is a bit floppy and dull compared to the other strings. The bass itself is quite bright, and the other strings sing, but that low B is just dark and angry.

I would consider buying a thicker low B from DR Strings to compensate for the floppiness, but I worry that it might be even duller compared to the string I have now.