Erika, where are you located? Are you at a boarding barn with a trainer? I know of a few good dressage instructors that work with hunters & jumpers, but I don't know if your situation would allow an outside trainer.
I've been with this trainer for way too long (he's like a dad) I would feel funny bringing someone else in. But I can talk to him and tell him how beneficial it would be to have some type of dressage lessons. I'm sure he'll consider it. Not only me, but my sister and other people I ride with would all benefit from it. He knows a lot, but he's mainly a hunter jumper person.
You can PM me some names if you want...