if they are the OEM ones thats as smooth as your going to get it, broken motor mounts will make the car more rough, id check my other mounts if i were you and make sure they are all ok. also are you suffering any performance issues? i saw you had another thread about the check engine light, if your having misfires (it would illuminate the check engine light) then the car will vibrate at an uneven rate, thus making it vibrate more.