The only thing I would change in a bent-plate bridge is to provide it with holes for extracting the strings without the need of passing them back through it for their whole length.I won an Fender American Vintage Hot Rod P/J bass that came with a high mass bridge, I could never really get the action low enough so I finally took it off last year put a vintage bent plate on it and the action's where I want it now and it sounds the same, feels the same, still just one barely discernible dead spot and sustain is the same. The volume is the same unamplified and if anything it feels more resonant than it did before.
It happens to me to frequently move expensive strings from a bass to another just to check how they sound on different models.
Doing this with a bent-plate bridge requires rectifying the strings’ profile at the headstock, otherwise the strings will remain entangled in the bridge saddles during the extraction process.
Rectifying them more than one time may generate dangerous crimped areas that may break !
Tone and sustain-wise I didn’t find any difference whatsoever between hi-mass and bent-plate bridges.
I had actually a bad experience with a BabicZ on a P bass because I couldn’t adjust the action to the same setting I was using when the original bent-plate bridge was installed, so I had to remove it.