Sway bars keep your vehicle from rolling tightening them up will actually make driving over potholes and similar bumps WORSE.
In general unless you're hearing knocking/rattling from the suspension bits or the factory rubber is visibilty shot then upgrading the bushings wont do much to help you.
Springs and shocks are what make or break ride comfort. (FWIW the sway bar is technically a spring, but one that is only ever used in hard cornering).
Tires can do a lot to improve ride comfort as well, more rubber and less wheel typically helps, smaller overall diameter typically helps.
Going for comfort you'll lose performance, it's a trade off, and the VX wasn't ever really designed to be a smooth riding vehicle.