Need some help with my curve

I throw a curve now but its kind of a slow, looping curve. Not as much as Barry Zitos of course but along those lines. Also, at times it isnt always 12-6, instead it has a little lateral movement but i think thats just the way i throw it sometimes. What i want tho is a more aggressive, sharper, and tight 12-6 curveball. Any recommendations on grips, arm angle, etc.?

I had the same problem earlier but now mine is like a 12-6. You dont have to change anything, it will come. Once you use it more it will eventually become a tighter curveball.

Throw it was fastball arm speed. Follow through hard.