I think the main thing for this bass is the Classic taper. It's not for everyone, although I think people can adapt more than they know to narrow spacing. Tight string spacing on a five string is SO much less fatiguing to play.
Using a heavier gauge on the G string will help, but eventually the tension disparity get you. But there's no escaping the physics. The smaller mass just doesn't compare to the tone of the other strings. Every single pro player I know avoids the G string if they can reach the note on another string. Look at Tony Levin - he didn't evven let the G string on his bass!