How far should I be able to cast a 1/16th oz jig, with a 2 inch curly tail, on 6 lb line, using a 7ft ul spinning rod, size 30 spinning reel?

I was bank fishing today and could not get more than about 20 yds. Frustrating, cause I needed to fish structure about 25 yds away. What can I do to get more casting distance?