Currently on the Flat we use this:

Over Fences:

Or (on second ring)

I am looking into getting one of these for the flat to help soften her through the mouth:

Any ideas on a bit for over fences or should I just stick with what I have? I wish I didn't have to use such harsh bits but she is still learning and hopefully as she gains confidence she will come back to me easier.
Thanks for in advance for any advice.
Oh and I guess I should add that I have very soft hands.