The fingers should be more active in the bow hand, not just reactive. Character is the most important thing in music. Exaggerate, go overboard musically. Don't let rhythmic ornamentation interfere with melodic aspects. Let the impulse play itself out.
Sound comes from the shoulder from a rhythmic swing.
Practice with a slow bow close to the bridge in order to gain control over your tone. Release weight into the string. Relax the bow arm into the instrument. The maximum sound is created by pulling the string to the side, not pressing it down. Pull more to the side to prevent pinching of the sound.