Thanks for all the feedback and info/recommendations everyone!!
I just tried my mare out in a loose ring and she seemed to like it, and listened better in it...although I am not going to draw any solid conclusions from 1 ride, need some more to really tell! ;)
To those that mentioned the Myler comfort snaffles, I've always wanted to give that a try, and I know that some of them are now dressage-legal but unfortunately for me, I Event and the dressage portion of Eventing is still going by the FEI rules and they haven't changed those (yet) to allow Myler bits in. Hopefully they will someday but until then, I'd really like to find a USEA dressage-legal bit that my mare is happy in :)