When I bought Amber, she was being ridden in a corkscrew full cheek. She's far too sensitive for that. She can get strong, but that is not an issue if you know how to ride her. It's never unmanageable.
So away with that when I got her, and I decided to try something as mild as possible. A loose ring french snaffle. After buying her, obviously riding her more, I noticed she really isn't a fan of too much movement. It irritates her.
I think it's the rings more than anything. I don't think she would like a mullen mouth, and I want to avoid the nutcracker action of single jointed snaffles.
I'm considering an eggbutt french right now more than anything, I think she likes the mouthpiece fine, so I think that would give her more stability on the sides and thus less movement, but still the give in the mouth.
However, I am quite open to other suggestions, hence this post. I'd rather not spend a fortune on playing the lottery with bits, so I'm hoping to have some options to look over before I make any final choice.