Maybe you aren't looking in the right places! I don't know where you are in Washington, but there are quite a few great powerlifters out there (most notably Brent Mikesell); maybe you ought to meet up with one of their crews and give it a run. You can easily look up your state chair in any of a number of organizations; if you need help, just drop me an email at firstname.lastname@example.org.
You could even just post something here on T-Nation to find someone in your area.
Practice, practice, practice! The best way to learn the position is to force oneself into it. I practice my arch frequently in addition to my actual bench sessions.