I doubt Fender are using the best parts they could source on this bass, so you could use this opportunity to replace the electrics with better components; new loom, pots (audio taper) and cap. IME this [i]will[/i] improve the sound of your bass.
As far as I read things, changing the caps won't add or subtract bass. The cap is what turns the pot into a tone control, by creating a variable low pass filter that progressively removes the top and mids. Better caps will allow better control of the filtering of the top and mids but it's the quality of the pots that will increase the volume of the whole bass, which will probably unlock bass frequencies your current pots don't let through, but caps they don't add any frequencies.