Another thing to add to this; try using your pinky finger more frequently. Have a legato lick that you are more comfortable with using your first three fingers? Try using your pinky instead of your ring finger in a practice routine. This type of betterment is simply achieved through repetition. You are training your pinky just like you had to teach your other three fingers. Patience my son. I feel there really aren't too many fast routes to this kind of thing; it simply comes via practice.