They will never be able to work something out if you don't ask. And listen, listen, listen. Honestly exchange information about what's best for you, your horse AND your trainer. Don't have unreal expectations for your horse. Listen without interruption.
Respect flows from owner to trainer and vice versa.
Discussions about differences of opinions are always done in a professional and calm manner. Let the trainer know if you feel you should move your horse and give them an honest chance to improve. If your research is done about your trainer and the communication flows well in both directions in your training relationship, you shouldn't have to look for a new horse trainer anytime soon. You'll be earning yourself many more blue ribbons in the future and increasing the value of your animal by hiring and keeping a good trainer.