She's finished, solid, push style, not too bendy, not too stiff, and she has no vices or issues that need correcting or anything along those lines. 

When I started her, she ran in a smooth mouth o-ring snaffle/no tie down but it just wasn't quite enough as we added speed. 

She now runs in a twisted wire dogbone simplicity but I feel like it's just a little bit too much even with a loose curb chain.

I considered putting her in a twisted wire dogbone o-ring, but my concern is that we would not have enough lift should I need it. 

Y'all have any ideas for something that's a little bit more than an o-ring but a little bit less than a simplicity? She works best in twisted wire dog bones or chain mouthpieces.. 

Have you tried a Sweet 6?  I graduated my mare from an O ring to the sweet 6 w/a dog bone with no problem.

I like the no hit bit for ones that don’t even need the lift. It’s got no curb and it works really well for one of mine that is really light but you’ve got a little more than a traditional snaffle when you need it. It’s also got the delayed reaction which your horse is used to 

Rosie gag (chain mouth)

Hodges futurity bit with chain mouth