I'd say, try a different pedal. The ODB-3 has its place but bass distortion has moved on in leaps and bounds since. It's a very fizzy pedal so might not play well with an already bright and aggressive bass.
I'm a massive Spector fan, always have been, and I've always thought they sounded best distorted. I certainly never play mine without some overdrive!
There's no reason for an active bass to not play well with a distortion pedal, unless the output is particularly high - thinking about it, if your Rebop has the original non-adjustable Tonepump preamp it could be overloading the pedal...