Here's the thing. You said you want to progressively make your bass "play better". If your current bridge is stable and functioning, a new bridge will not make it "play better". A new bridge will hold the strings in the exact position they are now. That's it.
Better to start looking at things like the nut: is it optimized? (Being Epiphone it likely could use a touch up). A perfect nut is a revelation to playability! The frets: are they due for service ? (level and dress by a GOOD, renowned luthier or a PLEK) Well done frets are a revelation to playability!
What many here are saying is that throwing money at the bridge won't get results like nut and frets will. IMO, it would be the last thing on the list for playability as long as it isn't slopping around.
If it is sloppy, that's another matter.