I don’t have personal experience with him, but I have heard generally good things about Tim Kunka who works out of the Seattle Polo Club barn in Enumclaw. I have a co-worker and a couple of acquaintances who have recently/are currently using him for training similar to what you described. Here’s a link to the Polo Club web site:
http://www.seattlepoloclub.com/equestrian-center/#equestrian-center/trainers
You can look him up on FB too.
